I agree with Lee Higgins that music is an "active intervention" between facilitators, participants, coworkers, and pretty much anyone.
In the Early Childhood Department at NYSCI music is used as a way to bring the kids together to do group activities, get their attention, and guide them to a common goal, which is amazing because the "little people" aka toddlers/prek kids have a one track mind on whatever they have honed in on. To see how music influences them is amazing.
With the college students that I work with, everyone has their own flavor of music and we all share it with each other and occasionally bring it out onto the museum floor, where I'll notice how it changes visitors and staff members attention to the activities that are being done. It brings and engages more people to what we're doing and it gets them to question and want to try out our activities.
Music has had me participate in a community, and the most memorable one, would be at ITP camp last summer. I participated in the camp and midway through ideas were sent around about doing a group project for the summer showcase. I joined a group of 4 people to make a turntable station and it was a blast! We all had different strengths and knowledge about the things that we wanted done and had individual roles but the one thing we all kept coming back to was the sound we wanted, and because of that we were communicating not only amongst ourselves but with other campers, students, councilors, and ITP staff. From that one music project we made so many connections and shared an awesome collaborative music maker with everyone. The best part was that sound we wanted changed so many times during the showcase based because everyone that had a turn changed it up a little creating a community sound.
The community at that camp makes me want to apply again.