I usually listen to bethoveen because when i hear it, it calms my nerves. The notes are soft, and the song is long enought for you to relax. My favorite song of Bethoveen is Fur Elise. I first experienced this when i played the piano when i was 8 years old. it influenced my mood enough to help me play his song entirely. Bethoveen song was originally played by piano, but over time, people added orchestra and violins.
Hope this helps!