“Many people are wondering just what this Up Next feature is, now that it is a bit more visible. This new ability will allow you to create a tiny playlist for the time being, with songs of your choice. Instead of clicking from one song to the next after the song is over, this temporary playlist will allow full indulgence into the listening aspect of your music, which is how it was supposed to be.”

Source: HOW TO Make A Quick On The Go Playlist With iOS 10 – Rhyme Hip Hop