havent heard half the songs, so several to try out.
early thoughts:
their criteria did make the list more unusual rather than mainstream, so i can only say personally that:
too low: Kelis-Milkshake at 170
Imogen Heap-Hide and seek at 147 (would be top 20 for me)
Beyonce-Crazy in Love at 48 (another should be top 20)
Pink only as high as 84?
Sia only as high as 66?
Adele no higher than 20?
#1 is good, but I would have went Umbrella-Rihanna #1, (or move Maps from 2 to 1)
Snubs: Duffy- warwick avenue or mercy
Shark Smile by Big Thief (they had another song in)
biggest snub= Toxic by Britney