Anything that is too stupid to be spoken is sung.

In George Bernard Shaw's Man and Superman, act II, there is the following dialogue: TANNER: Let me remind you that Voltaire said that what was too silly to be said could be sung. STRAKER. It wasn't Voltaire: it was Bow Mar Shay. TANNER. I stand corrected: Beaumarchais of course. | This quote has also been attributed to Joseph Addison. In The Spectator, 21 March 1711, Addison wrote of "an establish'd Rule, which is receiv'd as such to this Day, That nothing is capable of being well set to Musick, that is not Nonsense."