I hire a session musician to play on my new single, paying him $100. I record the whole session.
I ask him to play the opening to "Stairway to Heaven" and he does so.
"Well, I can't use that as a sample without paying"
"Ok play something like Jimmy Page"
"Hmm, still sounds like Stairway to Heaven"
"Ok, try and sound less like Stairway to Heaven but in that style"
"Great, I'll use that one"
and I release my song and get $5,000 in royalties.
Should I be sued for infringement, or the guitarist?
The problem, I suppose, is that if I had said "play something like 70s prog rock" and he played "Stairway to Heaven" and I didn't know what it was and said "great, I'll use that".
Should I be sued for infringement, or the guitarist?