I recall a time where almost every other advertisement by a band looking for members in the "Melody Maker" specified "No Breadheads". The term seems to have almost completely fallen out of use.
 
Given the state of the industry its probably unlikely any Breadheads would be looking to join a rock band anyway and would be aiming for one of the TV "talent' shows.

I think that phrase disappeared with 'The Lone Groover'

indeed, but there's still plenty of talented creative folks doing "it" for its own sake :-)

I had forgotten all about the Lone Groover. I used to love that.