Back in the 60-70s. Most recordings were done with vacuum tube equipment
some still do that has a big influence ,also who is doing the mixing
that’s why theBeatles sounded so good on most albums, they tried solid state mixers on 1-2 albums then went back to tubes ,Allen Parsons was excellent
on the mixing board . 80-90s much music was recorded a bit tipped up a bit during the era of disco and boom boxes ..