This is a very nerdy post BUT: ‘Rumours’ sounds pretty incredible for a 42-year-old album. Everything else is so immaculately tracked and mixed that a decently-maintained copy of the original 1977 release actually sounds better than the initial CD release, which was butchered by the digital remastering.
I’ve got the 45RPM version from RSD11 and it sounds incredible, like there’s an acoustic guitar in the room with you.