Concept art for a Beach Boys animated series by Fred Crippen. I have no idea how I had never heard of this. After seeing the picture below posted by Cartoon Brew last night, I did some digging and found the following description from an auction site that was auctioning some of the original artwork (including this drawing) ...
"After the success of the Beatles Yellow Submarine and the TV success of the animated Beatles and Jackson 5ive shows, a full-blown animated treatment was done, to bring the Beach Boys to Saturday Morning cartoons with the Beach Boys Cartoon Show. Original preliminary treatment notes, press photos of the Beach Boys (from the Sunflower time-frame) ten 8" x 10" images show artwork publicity photos, four hand-painted cels from the proposed pilot episode, where the Beach Boys battle an oil-spilling villain who wants to kill their surf, and an outstanding drawing of how the Beach Boys would look in the series, as drawn by Fred Crippen. The drawing is signed. All the artwork has a very Yellow Submarine-ish feel. The treatment states the personality traits of each Beach Boy and describes their favorite haunts. A rare Brother Records folder holds the paperwork. A truly historic find! Conditions range from Good to Fine. From the Fred Crippen Collection." Full link here.
(Photo credit to Cartoon Brew for posting it to their Instragram account)