Let's use May to share musical negativity, but in a good way...
#MayBeNot
Like me, it's wide and simple - just post one song daily with title/lyrics including a not or contraction: isn't, won't, can't, doesn't, etc.
You probably have 60% of all known music to choose from :-)
#MusicChallenge
Alt: Actor Jason Sudeikis in character as Ted Lasso, saying "Maybe... Maybe not..."
