Ken Hirai (平井堅)
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Ken Hirai — Love Love Love (Love Love Love 1998)
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Ken Hirai — It Will Break My Heart (-English Version-) (Missin you - It will break my heart 2002)
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Ken Hirai — Introduction - Here Comes K. H. - (The changing same 2000)
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Ken Hirai — When Can I See You (Missin you - It will break my heart 2002)
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Ken Hirai — Missin You -It Will Break My Heart (Instrumental) (Missin you - It will break my heart 2002)
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Ken Hirai — Holic (Half of me 2018)
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Ken Hirai — Half of Me (Anataninaritakatta 2021)
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Ken Hirai — Ladynapper (The Changing Same 2000)
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Ken Hirai — K. o. l. (The Changing Same 2000)
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Ken Hirai — Unfit in Love (The Changing Same 2000)
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Ken Hirai — Affair (Ken Hirai 15th Anniversary c/w Collection 95-10 "Ura Utabaka" 2010)
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Ken Hirai — Interlude - Brighten Up - (The Changing Same 2000)
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Ken Hirai — The Flower Is You (The Changing Same 2000)
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Ken Hirai — Kimiwa Tomodachi (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Omoigakasanarusonomaeni (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — The Changing Same - Kawariyuku Kawaranai Mono- (The Changing Same 2000)
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Ken Hirai — Interlude - Turn Off The Lights - (The Changing Same 2000)
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Ken Hirai — Woman Wnohigekiyori (Kokuhaku 2012)
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Ken Hirai — Itoshiki Hibiyo The Repose of Souls (Kokuhaku 2012)
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Ken Hirai — Come Back (Life is... 2003)
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Ken Hirai — Aoi Tori (The Changing Same 2000)
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Ken Hirai — Lakuen (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Life is... 〜another story〜 (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Love or Lust (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Miracles (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Candy (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Sing Forever (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Taboo (Ken Hirai 15th Anniversary c/w Collection 95-10 "Ura Utabaka" 2010)
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Ken Hirai — Kanashiinowa Kimidake Janai (Stare At 1996)
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Ken Hirai — Itsuka Hanareru Higakitemo (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Zankyou (Soredemoshitai / Onnajisamishisa 2014)
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Ken Hirai — Stage (Stare At 1996)
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Ken Hirai — Plus One (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Stay with Me (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Nazedaro (Stare At 1996)
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Ken Hirai — Mahoutte Itte Iikana? (Ken's Bar 2017 X'mas Special Live!!) (Todokanaikara 2018)
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Ken Hirai — Aozorasanka (Grotesque 2014)
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Ken Hirai — Onnajisamishisa (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — You Are The Sunshine Of My Life (Style 2003)
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Ken Hirai — Hanabira (Un-balanced 1995)
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Ken Hirai — Tomorrow (Soredemoshitai / Onnajisamishisa 2014)
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Ken Hirai — White - Bokuni Aitai (Un-balanced 1995)
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Ken Hirai — Soredemoshitai (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Fake Star (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Naite Waratte (Stare At 1996)
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Ken Hirai — Air Cameraman (Aishiteru 2010)
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Ken Hirai — Doshaburi (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Unchained Melody (Aishiteru 2010)
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Ken Hirai — Yubikiri (Stare At 1996)
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Ken Hirai — Onegaijulie (Hyadain No Rererere Remix) (Kokuhaku 2012)
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Ken Hirai — Kokuhaku (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Aitaiyo (Stare At 1996)
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Ken Hirai — Kimiga Wakaranai (Stare At 1996)
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Ken Hirai — Kusare Enn (Stare At 1996)
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Ken Hirai — Boku Ha Kimi Ni Koi Wo Suru (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Yokogao (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Aishiteru (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — We're all alone (Ken's Bar III. 2014)
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Ken Hirai — Ellie My Love (Ken's Bar III. 2014)
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Ken Hirai — Style (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Intermission (Ken's Bar III. 2014)
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Ken Hirai — Open (Ken's Bar III. 2014)
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Ken Hirai — Even If (Everlasting Version) (Half of me 2018)
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Ken Hirai — Kazokuninarouyo (Ken's Bar III. 2014)
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Ken Hirai — Jyunko (Ken's Bar III. 2014)
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Ken Hirai — Killing Me Softly With His Song (Ken's Bar III. 2014)
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Ken Hirai — My Way (Ken's Bar III. 2014)
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Ken Hirai — Close (Ken's Bar III. 2014)
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Ken Hirai — Canvas (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Aini Kodaware (Kimino Kodou Wa Kiminishika Narasenai 2015)
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Ken Hirai — Todokanaikara (Anataninaritakatta 2021)
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Ken Hirai — Virtual Insanity (Ken's Bar III. 2014)
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Ken Hirai — Kittenonaiokurimono (Ken's Bar III. 2014)
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Ken Hirai — サンマルニ (Anataninaritakatta 2021)
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Ken Hirai — Timing (Ken's Bar III. 2014)
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Ken Hirai — Kawaisoudayone (#302. 2019)
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Ken Hirai — Yatsuranoashiotonoballad (Ken's Bar III. 2014)
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Ken Hirai — Taiyou (Ken Hirai 15th Anniversary c/w Collection 95-10 "Ura Utabaka" 2010)
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Ken Hirai — Cat (Ken Hirai 15th Anniversary c/w Collection 95-10 "Ura Utabaka" 2010)
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Ken Hirai — Bokuga Donnani Kimiwo Sukika Kimiha Shiranai (Ken's Bar II. 2009)
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Ken Hirai — Desperado (Ken's Bar II. 2009)
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Ken Hirai — Moon River (Ken's Bar II. 2009)
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Ken Hirai — Tug Of War (Ken Hirai 15th Anniversary c/w Collection 95-10 "Ura Utabaka" 2010)
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Ken Hirai — New York State Of Mind (Ken's Bar II. 2009)
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Ken Hirai — Heart Of Mine (Ken's Bar II. 2009)
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Ken Hirai — Shiroi Koibito Tachi (Ken's Bar II. 2009)
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Ken Hirai — Stardust (Ken's Bar II. 2009)
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Ken Hirai — Because of You (Ken's Bar II. 2009)
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Ken Hirai — Lately (Ken's Bar II. 2009)
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Ken Hirai — Egao (Un-balanced 1995)
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Ken Hirai — Ho (Bokunokokoroo Tsukutteyo 2017)
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Ken Hirai — Easy (Un-balanced 1995)
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Ken Hirai — Yaburitai (Un-balanced 1995)
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Ken Hirai — Uta (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Negative Boy (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Precious Junk (Ken Hirai 10th Anniversary Complete Single Collection 95-05 Utabaka 2005)
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Ken Hirai — Girls Girls Girls (Japanese singer 2011)
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Ken Hirai — Time (Ken Hirai Singles Best Collection UtaBakaTwo 2017)
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Ken Hirai — Love Is Blind (Ken's Bar III. 2014)
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Ken Hirai — Onegai Julie (Japanese singer 2011)