CAB

I disagree completely anyways on the topic of forgotten #1's:

Thank God I Found You - I remember the remix but not the original at all which is weird as hell

The First Night - Monica

Check On It - Beyonce

Crack A Bottle

Close To You - Maxi Priest (yass i'm going old school)

This Used To Be My Playground - Madonna

Definitely those from the AI winners.

Like, can you even name the artists and the song titles?

CLOCK HA!

Pretty much every single Elvis Presley #1. And he had 18 of them.
Majority of The Beatles' chart-toppers are also forgotten, except one or two.
Oh, and Harlem Shake.