I tend to use a variety of music for my treatments.
I like classics and I have some collections which give a nice atmosphere. One particular one is called Classical Ambience and it's lovely. The Four Seasons is a good one as well. There are couple of CDs by Vangelis that are good, Voices and Oceanic - without sounding like lift music.
As you say, though, it is purely a matter of personal choice but I do have some clients who prefer no music at all , the sound of silence does it for them!
Love