There's been quite a few radio stations in the past that have featured underground dance music (Q101 Sonic Boom, Energy 92.7), but I don't really think that style of music is being played anywhere other than WNUR 89.3FM at certain times of the night, to my knowledge. If you're looking for more mainstream style dance music, 96.3 still does their B96 Mixmaster nights, and there are a few other stations as well that I don't quite remember.

A lot of the MWTA's have internet radio shows, maybe that's your best bet??

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