ZZ Top: The Musical?

OK, this is such a weird rumor, but it comes from a very reliable source.

Supposedly there is some sort of ZZ Top musical that is in development right now?
The rights have been sold and it is being worked on right now?

If this ever happens, remember, you heard it here first. If it never happens...well, then this post never happened.

Frank Beard, laying down some drum tracks for the new ZZ Top album...

...at least that's what it seems from a recent Twitter post from Rick Rubin.