What aspect of Mississippi Delta Blues is the most important in influencing later rock musicians? It featured a guitar. The emotional commitment of the performer. It’s “bluesy” feel. The lyrics. After speaking to others on the web, I found the answer. I say it’s the rhythm and guitar and the emotional commitment. You wouldn’t have rock n roll if people weren’t moved to get up and dance and it was that trance enducing repeated rhythm in some blues song that just got people moving.