"I just came from Aspen, Colorado and they had fifteen kids I played for and they all played horns"

Jimmy Smith's quote is likely describing a performance he just recently gave in Aspen, Colorado. He likely played for a group of fifteen children, all of whom played horns. This might mean that he was betting a school band, or a youth jazz ensemble. It is possible that he was teaching a masterclass or workshop, or that he was just carrying out for the kids. Whatever the case, it is clear that Jimmy Smith had an excellent experience in Aspen, Colorado, and that he had the ability to share his music with a group of young, passionate artists.