I'm roughly the same age as you (a tad older) and most of what I listen to can loosely be described as guitar based rock music. That said, you could readily swap rock for disco in your statement and be equally correct. You basically just described any number of the biggest rock bands of the 70s -- Kiss, The Eagles, Journey, Styx, etc. . . For a lot of folks disco was a more authentic means of expression than anything going on with the classic rock scene which, let's face it, was fairly monolithic at that time.