[TheThinkTank] Critical mass & music

I'd like to ear from the community about your technical solutions when it comes to play music in a critical mass. We in Trois-Rivières are starting to built the habit of having a critical mass each month.

Music is kind of great during those events.

Having a DJ on a trailer is our ultimate goal, but in the meantime we can simply play music with our bluetooth speaker. Having only one person playing music cannot make it heard from the mass.

Any software of ideas to have the entire mass play the music in sync? Are you using a special app? It be great if we could have one "master" and many "slaves" to make the music travel throught the mass.

Any cues?

Thanks

Claude Long life to critical mass Trois-Rivières, QC, Canada