I don't know about friends, but what time I spent with The Beatles they were very courteous to me.
Only one of us would usually sing lead. Which most of the time was, Mickey or Dave. They thought it was perfectly a natural routine, because Mickey and Dave saw themselves as TV actors.
The four of us couldn't have made a record with the time left over when we were shooting the show. We were on stage from 7.30 in the morning 'til 7 at night. Later on, when there was a break from filming, and we were sick of doing it the old way.
The Monkees was a straight sitcom, we used the same plots that were on the other situation comedies at the time. So the music wasn't threatening, we weren't threatening.