To give this an important bump [BUMP[] Warner Bros.entities don't own the rights as they do the A'm'iacs (

) but anyway, it's because of the production music Quick Draw and many others like Art Clokey's Gumby and a few 1958 WB cartoons used due to a musicans strike.[Even TV ads..incudinga four minute with Frank Fontaine, the influnnce on the goofy "Huck Hound" African jungle lion, and that one "Bugs Bunny" cartoon "Rabbit's Kin" puma, "Pete Puma"'s voice, used a lot of this
It was the music credited to Capitol Records exceutive, John Seely, who cowrote some cues but licensed a lot of cues from different libraries--Capitol, Mutel, EMI Photoplay, Langois, Sam Fox, Structual Music, Carbert-Music-Que, Southern, KPM, Berry, Zephyr Records, and Chappell being among these.
Composers included John Seely, William Loose, Jack Shaindlin, Roger Roger, Emil Cadkin, Jack Cookerly, Ed Lund, George Hormel, Alexander Laszlo, Frank Sterling [born Dennis Berry], Mahlon Merrick [his real name-used many pseudonyms] , Phillip Green, the Farnon [Yes, bith Dennis and Robert] and Chudnow brothers, Spencer Moore, Capitol's legendary music director Nelson Riddle, Henrik Neilsen, Raoul Kruashaar, Irving Freidman, Henry Russell, Hans Conzelmann, Hecky Krasnow, [Walter Lantz muscial director] Clarence Wheeler, Louis DeFrancesco, Robert Mersey, David Buttolph, Dave Kahn, Don Kirsten, Ib Glindemann, Herschel Burke Gilbert [the list is long!], Jack Belasco, Jack Meakin, and others.
[Example: The Frank Fontaine car ad mentioned above as seen oin YouTube used almost entire Phillip Green music, which also was among the major bulk of "Quick Draw" shorts.]
As you can see, and as Eark Kress noted on his MY NAME IS EARL KRESS blog, yet to be updated, [has it been yet?], fdor obviosu reasons it's a mess or work, buit itwas resolved as the "Huckleberry Houdn, Season 1" {WVH] and Clokey's "Gumby Essentials" [Classic Media] shows, but it was a number of soruces. Some online production sites have these for audition.
There though is an upcoming set of SATURDAY MORNING cartoons, and only the las,t H.Curtin scored QucikD raw trilogy [Snooper, Augie], are there [but even Hoyt Curtin's music then was far better than "The Pebbles and Bamm Bamm Show" and other travesties.]