Naxos Music Library Naxos Music Library is the world's largest online classical music library. Naxos offers over 2,700,000 tracks of classical music, jazz, world, and pop/rock. It includes the complete BIS, Chandos, Hänssler, Hungaroton, Marco Polo, Naxos, Ondine and selected titles of other leading independent labels, with over 600 albums added monthly.