Tolong jelaskan mengenai Album studio dari Ken Hirai

Stare At (1 Desember 1996)

The Changing Same (21 Juni 2000)

gaining through losing (4 Juli 2001)

Life is... (22 Januari 2003)

SentimentaLovers (24 November 2004) - laku 1.900.000 keping

FAKIN' POP (12 Maret 2008)

Ken Hirai 10th Anniversary Complete Single Collection '95-'05 UtaBaka (23 November 2005) - berisi lagu debutnya hingga singel "Pop Star"