This is optional and totally up to YOU! You are free to choose between two different formats. We offer classes in which the music is embedded, thereby not requiring a streaming service, as well as classes with supporting playlists provided on Spotify. You can decide at any time which format serves you best. When using Spotify, we do offer these pro tips:  Be sure to open Spotify either in a new tab or on your desktop’s App. Doing so will enable you to adjust the music volume independent from the class volume. Make sure your music volume is set to support the teacher voice – so both are equally audible for you. Solidify the premium service option so you can enjoy class without commercial interruption. Make sure the shuffle setting is turned OFF on your supporting playlist before class begins (so you stay in sync with the rhythm and timing of your class). *Note* When taking class on mobile, we recommend classes that do not require an accompanying playlist as you will not be able to adjust the volume of the playlist.