Right now, since I'm really into SPN, the soundtrack is my favorite one to listen to. All the 80's classic rock songs and Carry On My Wayward Son 😀
I usually like soundtracks in TV shows, less in movies. In most movies I'll like 1 or 2 of the songs, rarely more. As for the score albums, those I just don't like. The music goes with the movie, but alone I just don't find it appealing.
Else than SPN, I have 2 BtVS albums (radio Sunnydale S7 and OMWF) and lots of songs from Glee (I don't buy the cds, for I think it would take way too much place on my shelves), Vampire Diaries and Pretty Little Liars.