I'm just setting up my own classical music label and the first CD is in work. The logo should be classically simple and work with both color and black/white. It should contain a violin key of the music notes or something which thinks of classical music. Singing or something with sound or soundspeakers would also be good. Red as color would be good. I add a few sketches. Of course there should be something unique but simply simple. Play with the music elements.