I have trouble finding something for most characters or couples (though I look) but Jarred and Derek have a few like: Beat me Up by Allison Ireheta, Bruises and Bitemarks and a couple lines from The Heat by Good with Grenades, and random songs by Nickleback. >.>

And then Shin has a playlist of music I think is similar to his band or whose dance style he would like.

but I've been inspired or used songs more in the past. It's only now that my characters defy all music I know and won't fit songs well.