Are we talking musicians who have influenced other musicians?
It starts with the Beach Boys. Paul McCartney was quoted as saying that Pet Sounds served as their greatest influence and Pet Sounds still to this day has a very rich effect on contemporary music. Sargent Peppers Lonely Hearts Club was inspired by the Beach Boys.
The Beatles who are the greatest band ever still continue to inspire musicians and artists all over the world.
You've got artists like James Brown whove managed to directly influence a lot of early punk rock.
Artists of today Animal Collective really takes the cake.