I think a good answer to this question can be given in your last "x" number of purchases:
Hi I'm Kevin, and I've been listening to:
Gamma Player vol1 by Jeff Mills,

Liebe Ist by Stephan Bodzin,

Brassed Off by Jim Rivers,

The Last Resort by Trentemoller (hasn't left the car since last Jan!)

Remedy by DCB

But hey, the person you're talking to might fall asleep with that level of detail. Just think people's tastes evolve over time, so it can be hard to say I listen to ______ period.