[Frostwraith]

Originally Posted by CHz

It seems Wada did 20 songs, so a decent amount.

According to that link, Yoshito Sekigawa also did one song (which if I remember correctly is an arrangement of a song from Gaiden originally composed by Yuka Tsujiyoko).

The 4 music CDs appear to have the main game's music, while the 5th CD (dubbed the "data disc") has songs found exclusively through amiibo, DLC, the English version of the ending theme, and the original Fire Emblem Gaiden soundtrack. Some of these songs are taken from previous games of the series, either in original version or newly rearranged.

As such, Yuka Tsujiyoko, Hiroki Morishita, Rei Kondoh and Yoshito Hirano are credited as well.