Obscurity factor: 8
Anyone who loves 60's and early 70's bubblegum music should know about the Cattanooga Cats. This series followed the animated antics of the similarly named band as they traveled around singing their upbeat music. The series was made up of segments with the Cats, short musical interludes, something like music videos and segments featuring three other sets of characters - Around the World in 79 Days, It's the Wolf! (featuring Paul Lynde as Mildew) and Motormouse and Autocat. Originally an hour long, Saturday morning show, it was shortened to a half our in its second year and was cancelled in 1971. Casey Kasem, noted radio DJ voiced one of the cats in the speaking portion of the show. He didn't contribute his voice in the songs, however.
The Cats have developed something of a cult following, though the actual episodes can be hard to find. Many of the musical interludes can be found on YouTube. Above are the opening credits, uploaded by cartooncoon.
Obscurity factor: 8 (enjoys a small cult following, not on DVD, available on YouTube)