You've got to be

As I mentioned before, I'm reading Norman Lebrecht's "Companion to 20th century music".
Besides having no reference to Spike Jones or P.D.Q. Bach, the entry for the word "humor" has the following amazing statement; "music and humor are essentially incompatable"
???.
Music is an essential and integral part of life, and life is, as we all know from our own personal trials and tribulations, pretty much a cheap joke.
Thanks god!
Beethoven's bombastic fist wavings are always worth a chuckle. He did, if you remember properly, feel himself superior to the aristocracy because he believed in "equality".
That word is a joke in itself.
Mozart's childish analities could provide a years worth of SNL material.
Haydn purposely wrote humor.
And that is just surface of the classical.
The romantic period was just plain silly, as romance always is, and therefore qualifies as humor. If you can't find a chuckle in Wagner's ring cycle, you have my sympathy.
As for the 20th century, I'll agree that the first half was not very funny, largely due to a serious infection of academicism.
And, of course, the concept of reducing music to some little mathamatical formula is worth a supercilious snort if anything is.
Once Rock'n'Roll bloomed, however, music came alive again.
Because it was funny.
Because music is life.
And life is a joke.