I just found this incredible resource on the Internet Archive for all of these classic records in mono.
For most of the history of recorded music, music was recorded in mono, so if there even was a stereo mix, it was only every an afterthought. Music was recorded and listened to in mono. It wasn’t until late in the Beatles recording history they started giving their stereo mixes more attention. But anyway, here is the link. Hard to beat free music and these are classics.