English Art/Literary Music

"The jazzers say ''be what you play''," he smiles. "I really want to be what I play. ***It’s the difference between having a conversation that moves you or someone who tries to take over."*** While there are some drummers who like to show off flashy moves, technique and rudiments, they also forget about the music, he suggests – "It should be about entertaining. It’s not just about what you can do with the drums. You see some people out there who are trying to be so clever they forget about why they are there. They are musicians after all."

Dear native English speakers!
Please help me clarify what they mean by the sentence asterisked - I can't really get the point. What does it have to do with the previous sentences?
P.S. It's a drummer talking.