Way before MTV..you could love a song and have no idea of who sang it. Or just the rare Bandstand appearance. Those three guys all had the same sound,the same "I'm alone drunk in a bar" hit songs. I thought Piano man was being sung by Bob Dylan for awhile ("Stuck in the middle with you" Steeler's Wheel,also) so that threw me off in the early 70's.
I'm still learning what some looked like from youtube.