I can't, it isn't compatible with the LK Avalon TSF version of JJ2, and since that's the only version of JJ2 I own, I'm unable to get Plus. :L

Back on subject, though, I'm pretty sure that Vanilla crashes if it doesn't find Music. Although, I've never tested it online, so I'm probably wrong. XD
Oh, and if Vanilla JJ2 does indeed cope without the Music Files when playing online, KRSplat's idea(Having the MP3s in a seperate Archive) could be quite good.