Man, you people are great. I’ll add some more contributions.
An annoying classic: “The Duck Song”
youtube.com/watch?v=MtN1YnoL46Q
If the link doesn’t work, it’s easy to find on YouTube. Apparently, people liked it enough for the guy to make two sequels of this song.
“Sunshine, Lollipops, and Rainbows” by Lesley Gore
I normally hate all happy clappy music and this is probably the most obnoxiously cheerful song there is. I first encountered this song in a cartoon on YouTube in which four guys were taking a tour of Hell and Lucifer showed them all each their personal hells. For one of them, it was a jukebox that would not stop playing this song even after he broke it.
A Girl Scout favorite. The Song That Gets on Everybody’s Nerves:
I know a song that gets on everybody’s nerves
Everybody’s nerves, everybody’s nerves
I know a song that gets on everybody’s nerves
And this is how it goes…
Bum, bum, bum…
(And repeat that one and only verse as necessary)
“The Emo Song” (a parody of SpongeBob’s “Fun Song”)
E is for emotional ruins everybody’s day
M is for miserable people
O is for on the dark side cause we have some fresh cookies
COOKIES! WOOHOO!
Last but not least, any song sung by animated chipmunks