When/why did vocals-guitar-bass-drums become the vast majority of rock music group makeups? Even with the occasional keyboardist, bands are almost entirely the same instruments.

Question

When/why did vocals-guitar-bass-drums become the vast majority of rock music group makeups? Even with the occasional keyboardist, bands are almost entirely the same instruments.

In: 917

Answer 1

Beatles? Doo-wop groups? 1940s/50s? Unclear.