The Merchant's Song is Piu-Piu's theme. It plays whenever the player talks to him or uses his shop. It is the only song to appear in all three games. In Chaos Rings and Omega it is Piu-Piu's battle theme. In Chaos Rings II, excerpts of this song are found in It's Me We're Talkin' About, the Yours Truly Returns Ending song, and Piu-Piu's battle theme, Now We're Rockin', is an upbeat rock version of The Merchant's Song.