I downloaded this character after the update.But the music of those characters that I downloaded before the update are still working for me,even I changed some new music with their name unchanged.By the way,Daniel Bryan(DLC)'s music is also working for me too.

Was his music working for you before the update?

Thanks for your answer.I am sad that Spike destroyed that useful function.

I'm getting the Buck's theme to play here. I'm seeing Young_Bucks listed on the edit and I have Young_Bucks.mp3 in the BGM folder.

I'm asking someone with a similar issue on my Jay White to try something -

If you have that file in your BGM folder, there may be an issue with downloaded edits' themes not playing. If so, we'd need to wait for a patch. If you want to test it, try making a new edit using Jay as a base, and set a theme under the Skills section (if it's not already listing Young_Bucks.mp3). If the theme plays for the copy, then it's gotta be something related to how the updated version handles themes from the Workshop.

There seems to be a music glitch lately - I’m not sure what’s going on, but I’ll look into it.

wrong music name?matt jackson ，nick jackson and taiji ishimori.