It's strange that they weren't selling CDs. Did they not record their music? They could collect enough money from one or two such performances on Arbat to fund the distribution of their musical performance.
My dad and I listened for about half an hour, and then the guys said they needed a five-minute break. They rested for twenty minutes, and then a police officer arrived and told them to pack up. Too bad. We were waiting, we wanted to hear more.