The thing is also with music, that most music is recorded with little to no budget. I listen a lot to music from 3th world countries (mainly African and Caribian) and those recordings, in the past and now are often done in ghetto area's with no budget at all. The sound may not be optimal, but the music is often of very high standards.
A perfect example is the works of Lee Perry during the 1970's. It's recorded in the very primitive "Black Ark Studio" in the Washington Gardens ghetto of Kingston Jamaica. The studio was actually a shack in the back of his yard, where he had an stolen prototype of a soundcraft I console, a Teac 3340 1/4 inch 4-track tapemachine, a Teac A6600 2 track 1/4" tape Recorder, a Grantham spring reverb a Roland Space Echo and a Mutron Biphase phaser. Mics were all dynamics from EV, Shure, AKG and Senheiser. His monitoring was a Marantz tube amp and Altec Lansing 612A speakers. That's all he had, no compressors, no outboard but those i mentioned and only 4 tracks on the tape machine. But that studio is crucial in the development of reggae and dub in the 1970's and hugely influencial on all modern music. It's where Bob Marley recorded everything between 1973 and 1977 (it was mixed in other studio's altough) and were the classic reggae albums of Max Romeo, The Congos, The Heptones and Junior Byles were recorded and mixed. It's also the place where he made all those crazy dub tunes between 1973 and 1979 (when the studio and his mind started to disorientate) that changed the way music is made a lot. The studio was set on fire by Lee Perry himself in 1980 because it was possessed by demons he said (Lee Perry was raised by a mother that was a voodoo priestess if you didn't know)
And like that there are many technical inferior studio's that made classic recordings. Their sound quality is not that good, but their musical quality is that high that it conquers the lack of good sound. It's that since not so long ago, it was only big budget mainstream artists that really could afford high quality recording studio's. The rest had to do it with way less.