Though I'm not into the whole pop/mainstream stuff, gotta admit that it's best for my step aerobic exercises

I try changing songs from time to time so that it doesn't get too boring, so here's what's banging out of the speakers:
Prince - Pop Life
Kylie - Can't get you out of my head
Benassi Bros - Satisfaction
Basement Jaxx - Where's your head at
Madonna - Hollywood (misc. remixes)
Patrick Hernandez - Born to be alive
Visage - Fade to Grey (remix)
KC & The Sunshine Band - Shake your booty/Get down tonight/That's the way I like it
Chemical Brothers - Out of control/Hey Girl, Hey Boy
Technotronic - Pump up the jam
The Weathermen - Move any mountain
Outkast - Hey Ya!
Data-Bank-A - Don't ask don't tell
and so on ...