thx for the link and itw ... interesting as always..
and Id say the answer is charisma for the sentence below

"I’m not the world’s greatest guitar player and not the world’s greatest singer, but I have got other qualities perhaps. How do you make one guy and a guitar interesting for two hours? It’s an art."
I once saw a guy from a huge band , he was playing solo with his guitar on stage. And unfortunately there was nothing... it was empty apart those who knew that guy and knew his songs. For me it was the 1st time I saw him (I was there for taking photos) and honesty this guy got no charisma and this do almost all. Sorry for my broken english...