And before anyone says anything, these are instrumental songs, but they might have some vocal parts in them. it's just that they're instrumental enough to be called instrumental by Billboard.
Here's the only instrumental song to hit #1 since I have been able to read! It jetted up to #1 after a meme started going around YouTube and Facebook. You can probably search YouTube for "Harlem Shake Videos" and see TONS. Billboard made changes to how they tallied the Hot 100 right around the time that the Harlem Shake meme was really hot. The change was that they would allow YouTube videos that featured songs to push those songs up the chart. So it was only natural that this one blasted up to the top and stayed there for 5 weeks!
Enjoy! And dance!
Baauer - Harlem Shake (2/2-2/23)
And here's a Top Ten Countdown of the Best Harlem Shake videos because apparently there was never an official music video for it