Here are topics that deal with all types of music and with dancing as well. This can cover the social and moral aspects of music or more technical themes, though those sort of topics really belong in Arts and Humanities.
How do amateur singers really break into show business?
The church (gospel music) as a training ground for rock or rhythm and blues stars.
What are the commercial prospects for the Jonas Brothers?
Discuss the downfall of your favorite celebrity or sports star (TI and Michael Vick come to mind.)?
Should there be a retirement age for rock stars? (I know this one is not politically correct)?
Do hip hop stars and their entourages model violent and/or inappropriate behavior to youth?
Discuss the political aspects of oi music.
Sex and violence in Country Western music.
Is Susan Boyle truly talented or an overrated media creation?
What influence does gospel music have on rhythm and blues and soul music?
What is the influence of hip-hop (and other similar genres) on television and film?