Marty spend the last two months teaching you how to play the electric guitar and he wanted you show off your skills
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"Okay, Y/N." Marty sat on a speaker "I want you to show me what I taught you."
"I'm not saying that I'm a pro, alright? Just please don't make fun of me." you calmly picked his guitar up and started playing the song he taught you.
When the song ended, you looked up at Marty who looked surprised and proud.
"What do you think?" you put the guitar down and smiled at him.
He grinned and raised his eyebrows
"Rock n' roll."