"Let's Groove" is a mandate disguised as a suggestion. Earth Wind & Fire recorded it in 1981 as a funk anthem built around one of the great basslines of the decade. The song tells you to move, to participate, to stop watching and start being part of the music. The lyrics are minimal because the groove does the arguing. Maurice White understood that dancing is not a reaction to music. It is a conversation with it. Let's groove tonight is not an invitation. It is a declaration of what is about to happen.