A couple of fill-ins:
#2 is Koda Kumi's Hana
#7 is Koda Kumi's Cherry Girl
#10 is BoA's Kiseki
#23 is Lena Park's Smile
and although they're not top 25...
#26 is Utada Hikaur
#27 and #31 is Namie Amuro
#33 is the regular version of Koda Kumi's Yume No Uta (I have like a hundred of them)
