Hey there!
I usually have music on in the room, and it's usually R and B. Beyonce, Shakira, Ciara, etc. I just buy the compilations.
I did once have my phone in playing my Spotify, and as I'm into a lot of old rock music (AC/DC etc) and some guys loved it, but alas, I felt I couldn't have my phone in the bedroom with clients ringing every 2 mins.
Go for the generic 'sexy' tracks, nothing too distracting, and as you said- it's a great timekeeper also.