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For me, it's Eternity by 4-Mat, I can't stop humming it!

Not now, but regularly "Demoscene Alphabet" or "Ziphead".
I guess more, but these came to mind instantly =)

mod.Axel F ... oh wait

the popular demo

bananasplit.mod

Not exactly hummable, and that tune sounds all over the place.

Well that was more for the Alex F bit at the start. But okay this one is pretty hummable (and also from 4-Mat).

bananasplit may not be hummable, but it's singable as hell

Onward

iedereen is van de wereld

Such a savage track <3

In the last few months a lot of times this: Rainbow Dash! by Radix and xyce

na na na na du skulla dumpa miiigggg

na na na na na na na telephoooone

The C=64 tunes from Last Ninja 2 Soundtrack by Matt Gray.

erm... is this a common sentiment? :) i always thought the main theme of banana split is catchy as fuck, and the other parts are a blast composition-wise, but they also don't get too crazy to lose the mainstream appeal. i do think it's one of the pinnacles of early 90s amiga music.

Not really demoscenic but close enough...Victory Music aka The end of Doom...which you even hear the stems in Doom Eternal, but it never really develops to the full motif from original Doom! So annoying!

Accel - Loader Tune 1. 24/7.

Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow Meow

Banana split is awesome, I love it. I was merely reminded of it by the mention of Axel F, that's all! I'm indifferent on its hummability.

mod.money (can buy me love), not really hummable but fuckable - will be played on my funeral

many. i humm and/or whistle or just silently enjoy it everytime.