LivePhish+ subscribers can save Playlists for Offline playback within the LivePhish app on your Android or iOS device.

-Go to any show in the catalog and click Add to Playlist - or click the 3 dots next to any song to create a custom Playlist.
-After creating the Playlist click the Menu button at the top left of the app and go to My Playlists.
-Open your Playlist and click the 'Available Offline' toggle.
-Wait for the download circle to complete next to each song.

Once completing the downloads you should see a green arrow next to each song, and on the My Playlists page.
As long as you do not log out of the app, you should be able to access those files at any time.