Not really meant for self hosting, but have you looked at listenbrainz? The software and data is open and it’s not a commercial service.

I use organic maps and it works really well

I usually call the CPU cores physical cores and logical cores. So a CPU might have 6 physical cores and 12 logical cores. Meaning that it has 6 real cores, but it shows up as 12 because of hyper threading.

It also works on iOS