Continously playing music in a dungeon?

Hello!
So I've used the Battle on the Big Bridge patch that replaced the Returner's music. Of course, this means BotBB plays on their hideout.
So I went to FF6LE+, searched the Returner map and switched its music with the Mines of Narshe music. However, the music doesn't play continuously as you go from room to room. I mean that any time you go though a door to another room/map, the music stops for a second, and restarts shortly after.
I don't consider this a priority issue, but it'd love to know what am I supposed to do to keep the music playing throughout the dungeon.
Thanks in advance.