I think Beefheart (named for his uncle's cock apparently), and Zappa are music for musicians. I
at Beefheart and coo and think WOW, but I don't stick trout mask bloody replica on after a hard night at the orrifice.
Zappa's a funny one.... His downright daft "comedy music" of the 60's and early 70's amuses me something shocking, love it, and there are some genuinely accessible things in there too, like Peaches En Regalia, son of mr green genes, king kong, as well as mental case pieces like yellow snow/st alphonso/etc. But his guitar hero stuff from late 70's and 80's is a pile of rancid horse vomit and turns my stomach.
If you doubt zappa...
Peaches.
Green genes
Montana (which HAS to be heard for the squeeky voiced guy....for real, no electronics)
And Dynamo Hum (a sensitive ballad about a girl who bet Frank $40[1] that he couldn't make her come.)
Yes the Mothers are all Motherfucker musicians, but Frank keeps them playing the same tune, so accusations of Jazz are a bit unfair.
[1]Relation of Colin's probably