Naxos Music Library
Please add the Naxos Music Library, which is a major online source of music recordings which will be of interest to most universities teaching music.
It has quite complex metadata because it has CDs containing several pieces of music, each with several tracks, and it has links between different recordings of the same piece of music. As the metadata they have is quite rich, it would be very good to see this exploited in Primo with child/parent linking and records for works as well as recordings. But even just getting the data in at the level of the musical piece would be a huge step forward. Summon has had this collection for 8 years now. It is long overdue to be added to Primo.
XU Qingbai commented
Maybe IMSLP too? Naxos and IMSLP seem to have a coop relation.