Hey Hollygram

Tons of nightclubs in Rome are in the districts of Ostiense and Testaccio. In Ostiense the "ristodisco" is the hip thing. You can grab a bite and dance into the wee hours

I figure you can likely hear a pretty good variety of music and hopefully find something you dig.
Testaccio's main drag (Via di Monte Testaccio) is full of pubs, bars, live music venues and clubs.
For Paris, around St-Germain-des-Prés church their are tons of dance clubs. Don't know much else but the Pariscope (entertainment guide) is supposed to have good listings and a section in English.
Cheers! Have a great time!
