https://techcrunch.com/2017/10/26/soundshares-new-app-lets-you-create-playlists-with-friends-stream-them-to-apple-tv/

SoundShare, an app that lets you text your friends entire songs, was already one of the more clever iOS applications available. Recently, the app rolled out an update that introduces a redesign and whole new experience called “Party Mode,” that lets friends play songs through your device – like at get-togethers, where everyone wants to hear their favorite music. These collaboratively chosen songs can also stream through YouTube to your Apple TV, by way of AirPlay.

While there are other apps that support sharing music with friends – Apple Music has an iMessage app, as does Spotify – the benefit to using SoundShare is that you and your friends don’t have to be on the same service.