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MOTHER3i, took the track translations from the fan translation of the game.
Technically, all of the source tunes arranged on this album are from Mother 3. However, a number of the tracks in Mother 3 were originally from Earthbound and Earthbound Zero and arranged for M3 by Shogo Sakai, so tracks 6-9 on this album are arrangements of arrangements.
Shogo Sakai isn't credited in the liner notes for composition on track 9, but there is a little bit of the Love Theme from Mother 3 in the beginning, which he wrote. Oddly, the arrangement is quite a bit shorter than the in-game version of the track, which features Love Theme more prominently (and is also an amazingly powerful tune).