As we all know, this day in age communication is king. I propose that Spotify allow you to add friends. Using your Bluetooth headset or phones speaker, Spotify would allow you to listen to music while taking with you're friends/family. The feature would be editable, allowing you to decide the volume "sway" as either heavier on their voice or the music. This would allow you to continue to jam out while having a conversation when you are driving, working out, crunching numbers in the office, etc.