It's not rocket science, folks.
Also, I get someone like Tim not being familiar with enough songs. However, if you know Yes, you're probably REALLY familiar with at least The Yes Album through 90125, and that's more than 50 songs. If you only want to rank songs on those albums, that's perfectly fine and shouldn't take more than 15-20 minutes. Heck...my own list didn't include anything from the last 25 years.
We're at 10 lists now, by the way.