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Smoke on the Water by Deep Purple is the song that Homer sings at the top of his lungs, if that's what you're asking.

EDIT: Sorry, I read your question wrong... I don't know what the song after Smoke on the Water is (although I'm almost certain that it's not by Deep Purple)... maybe someone else does.
IntoTheEther Reviewed by IntoTheEther on . Homer Simpson Smokes.. YouTube - The Simpsons- Homer Smokes Weed Come on...every stoner likes the simpsons! Rating: 5