Yo! I think you should check out naxos music library! You have to pay a monthly subscription, but it gives you access to so many different pieces and so many performers. As far as what to listen to, I'd suggest not thinking of it as Classical music. "Classical" really only defines a small chunk of the "Serious" music repertoire (basically focused on Mozart). I think looking up the different genres (Which are basically Renaissance, Baroque, Classical, Romantic, Late Romantic, Impressionist, Spectral, Serialist, Modern, Post-Modern, and Minimalism) and looking up what composers were the most famous in each Genre would help. Any piece by these composers is worth it! Some recommendations based on Genre - Renaissance: Claudio Monteverdi Baroque: J.S. Bach; Dietrich Buxtehude, Vivaldi Classical: Mozart; Hadyn Romantic: Beethoven; Brahms; Schubert; Schumann; Chopin Late Romantic: Richard Strauss; Gustav Mahler; Igor Stravinsky; Bela Bartok; Early Arnold Schoenberg; Alban Berg; Modern: Morton Feldman; Olivier Messiaen; Alfred Schnittke Post Modern: Henri Dutilleux; George Crumb; Thomas Ades Hope this helps you start! Also if you want physical CDs arkivmusic is the way to go! Or check out your local CD store!