THIS IS YOUR FRIEND'S RECORDING. Do not share this giving people the impression that this is your work. Give credit where credit is due. It would look something like this:
"Recorded by Friend. Mixed by RunOnce"
"Friend - Recording Engineer
RunOnce - Mixing Engineer"
"Friend, tracking, RunOnce, mixing"
And please, please, please, ask your friend. "Hi Friend, Thank you so much for letting me copy the files from the show. They sound great! Do you mind if I make a mix of the files and share with some folks? Here's a sample. I can credit you if you'd like. Thanks again -- RunOnce."