What's absolutely crucial to any song is a set rhythm that doesn't waver or drag on. Often, it can be seen as a deciding factor between a good and AMAZING song.
It just so happens that the Midnight Ramblers could write a book on the subject of rhythm with their rendition of Ed Sheeran's "Sing." From the constant fluxes in timing to the exciting wordplay, it's an infectious tune that's fun to watch. Fair warning, this just may be the song you keep on repeat for the next week or two.