The Campfire Song Song is sung by SpongeBob. Patrick was singing too, but he couldn't catch up because SpongeBob was singing too fast, so Patrick resorted to playing the drums near the end. The song was featured in "The Camping Episode". It can be known as the most famous SpongeBob song ever.
SpongeBob: [spoken] I call this one the Campfire Song Song. [SpongeBob playing the ukelele]
Let's gather 'round the campfire and sing our campfire song
Our C-A-M-P-F-I-R-E-S-O-N-G song.
And if you don't think that we can sing it faster then you're wrong, But it'll help if you just sing along...
Patrick: Bum, bum, bum....
SpongeBob: [sings extremely fast]
And if you don't think that we can sing it faster then you're wrong,
But it'll help if you just sing along
Patrick:[in the background, struggling to keep up]Sing another song!
SpongeBob: C-A-M-P-F-I-R-E-S-O-N-G song, Patrick!
Patrick: Song! C-A-M-P-F-I-R-E...
SpongeBob: Squidward! [Squidward keeps silent and just stares at them.]
It'll help! It'll help!
If you just sing along! [Fireworks] [smashes ukelele) [Patrick slams a drum on SpongeBob]