Me and my girlfriend were on the train together trying to listen to the same music however our headphones kept falling out. The feature would be a new section in the app, such as the newly added running feature, that allows you to connect to somebody else's spotify via your phone through a connection code they give you. The host would then be able to select music for both parties to listen to through their own seperate devices and headphones removing the need to share headphones. I am not qualified at all in this area so am unfortunately unable to develop this idea further but perhaps the connection could be through wifi or phone data as Bluetooth is rarely used for connection between parties and is battery draining.
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