Heard It All...

I'm not really a completist in music, but the only time I've really thought about this is with New Orleans brass band music. Because it's a small regional scene, and I'm specifically into the, let's say, post-'94 style (after Rebirth BB released Rollin'), for a while it was definitely possible to hear every single record.

About a decade ago some L.A. label paid for every young band to record and made a glut of records with dumb titles, a couple of which were great, most of which were not. I at least listened to these at Louisiana Music Factory (ie an old-school record store listening station, because New Orleans blessedly seems to operate a decade behind everywhere else). Which, btw, most of the records still aren't streaming, and some of which were only sold on the street. But this is the only genre in which I can imagine having heard it all.