Shop Theme (ショップのテーマ) is heard in all of the numerous shops throughout the game. Both the NES and MSX versions of the song have the same structure, but are implemented in different ways.
The title is translated from Japanese on the official MSX soundtrack.
Legacy of the Wizard (NES)
The Shop Theme in the NES version plays at a lower pitch than the MSX version. It also puts more emphasis on percussion and uses the same whistle instrument as heard in Lyll Worzen's theme. The song is track 8 in the NSF file and plays on the RP2A03.
Dragon Slayer IV: Drasle Family (MSX)
The MSX version is a little slower and plays at a higher pitch. The percussion is more muted and the bridge of the song doesn't feature the whistle. The song is track 8 in the KSS file and is played on the AY-3-8910 on the MSX and the identical-sounding YM2149 on the MSX2.