YouTube Red users can save songs for offline listening. For a limited time in YouTube Music, which was only achievable through mixtape feature, i.e. songs are automatically populated based upon your listening history. Technically it worked as well, but the users didn’t have additional control over what they going to listen to. Now users can choose their specific songs, albums and playlist for offline listening.
To save music for offline listening, tap on the Menu icon, (Three Dots), next to any song, playlist, or album, and select Save Offline. A pop-up will then appear (Same as the YouTube Offline Video), asking to save just the audio, SD video or HD Video (As Applicable). On iOS devices, swipe left on a song in a playlist and then select Offline.
To access your offline music, tap on your profile and Select Offline.
Although, Offline Mixtape was best suited for most of the users, YouTube Red subscribers now have full control on what they listen to offline in YouTube Music.