You should be able to manually select a relationship type just fine.
But I’m not sure which to choose: “Purchase for download” or “Stream for free”
Apple Music isn’t free after all and some releases might not be available for purchase (in the future).
Related tickets:
Related thread:
More thoughts
Maybe let it have it’s own relationship type like Amazon. Or rename “Stream for free” to just “Stream”, alternatively introduce a new relationship type for non-free streams.
What about attributes? Like “free” and “purchase” for downloads, “free” and “subscription” for streams. Was this already suggested/disussed? Can’t find anything right now.