I haven't heard the song by sifow... but I WILL was my first song by Namie Amuro :3 and it's so lovely and great

(although I think 6' 42'' is too long for a song xD)
P.S: you can find the song on the "LOVE ENHANCED SINGLE COLLECTION" and the single "I WILL" (I think that the one on the best-album is a shorter version but i'm not sure)