Really? I find 70s bass to be much more prominent than in modern music.
I was a reading a thread somewhere (Gearslutz maybe) on Paul McCartney's recording setup and it got into discussing how a lot of 60s and 70s stuff seems to have a lot of sonic space for bass to be heard. Take Led Zep or Black Sabbath, bands that you would expect to have massive guitar sounds when it's more the case that their guitars, as with the Beatles, have a very compact and tight presence on the recording, leaving much more room for the bass to be heard. Motown is the same - very compact guitars and keys, and lots of space for bass.
I find that modern music, especially pop and rock, is so bottom heavy that you really are only left with the 'impression' of an electric bass being in the mix a lot of the time. It's as if everything in the mix is adding to a big, flat, indistinguishable pancake of bass frequencies sitting underneath the 'main action'.


