For me, the Beatles. You had to be there to realise how innovative and important they were for their time. So much of their music and style has been incorporated into modern rock and pop so anybody listening to them today will not realise the huge amount they brought to popular music. If you go on Utube you can listen to a lot of their work but sadly the utubes showing them performing are mostly lip syncing so you get no idea how good they really were at actually performing live as opposed to just their song writing and studio work. A rarity that, as far as I can tell, is a live performance is : I never saw them live, but I listened to a series of their live performances on the BBC Light program where they performed their early stuff including many of the covers from their live act. MY sister saw them live but due to the tragic limitations of stage amplification at the time she could not hear them properly above the screaming. --- (She informed me she didn't go to scream herself.) So would you care to share your youthful musical experiences and influences?