I just posted this past Sunday about Clint Eastwood by Gorillaz being a persistent earworm. Also The Banana Splits theme is one of the earliest I can remember getting infected with. I have so many lingering ones! 😅
A Rollerskating Jam Named Saturdays - De La Soul
https://song.link/y/9S5lTgyfT2c
The "Mister Dobalina" part of Zilch by The Monkees is another old one.
https://www.youtube.com/watch?v=OedfVXal_Y8&pp=ygUFemlsY2g%3D
The Dandy Warhols' TV Theme Song, which has no real lyrics.
https://www.youtube.com/watch?v=oGT7Wrw2TI8