I like the idea of silent discos, people rocking out while there is no obvious source of why they're hacving a good time. Really cool. The downside of silent discos (not a big one, but hey this is an idea looking for a problem, not an elevator pitch) is that you need to check out a set of headphones to join in the fun, that's a lot of logistics. What if instead, all you needed to join a silent disco was your smart phone, the headphones you usually wear, and an app. Imagine a smart app that allows anyone to DJ for a given location, letting anyone nearby join in the fun at the push of a button. No headphones to check out, no equipment that can get lost or stolen, well additional equipment. (all participants are responsible for their own phones and headphones).
The requirements of the app are pretty reasonable, a centralized platform that the app could log into to confirm what stations are plaing in a given location, an app that provides the ability for users to verify their location and a music service. Realistically I would envision an extension on Spotify would be a reasonable approach.
