Two IDs: Access to music if Apple One plan used on ICloud storage ID or vice versa

All of my music is on one ID, including music bought from ITunes, all of my iCloud storage is on another ID. If I choose to use the Apple one plan on the ID account with iCloud storage, and cancel my music subscription on the other ID account will I still be able to access previously purchased music? Or if I get Apple one plan on the ID with the music, and cancel the iCloud storage plan on the other ID account, will I be able to access the data previously uploaded into the iCloud from that ID? How do I make sure all of the data - music, photos, iCloud uploads will still be accessible from both ID accounts if I consolidate subscription using Apple One plan? Would I have to do a “family share” to make that happen?