Fai's official character song is called Smile, but he also has another song for a different album ALSO titled Smile.
I believe the full title is something like 'Smile ~ Tooku demo wasurenaide', or at least that's what my iTunes saved it as, however long ago I dl-ed it.
Ehh, I missed out on 'Brand New Days', way back when. Would anyone mind uploading that again?