If you love Western Classical music, want to learn about the great Western Composers, or you are just a passionate music student, just head to www.musopen.org
Musopen is a not-for-profit organization that works to increase access to music education by providing free music recordings, sheet music, apps, and educational materials, without copyright restrictions. Put simply, their mission is to set music free.
You can search for something you love or just browse through their catalogs by Composer, Performer, Instrument, Period or Form.
Sit back and enjoy!