It's always interesting to me to see who benefits most from the Grammys. The iTunes singles chart features:
1. "Dark Horse" - Katy Perry (this was already #1, though)
2. "Happy" - Pharrell Williams (he didn't even perform this!)
3. "All of Me"- John Legend (interesting he jumped into the top 3)
4. "Royals" - Lorde
5. "Get Lucky" - Daft Punk
6. "Invisible" - Hunter Hayes (released right after Grammys)
9. "Brave" - Sara Bareilles
Kacey Musgraves jumped into the top 20 with "Follow Your Arrow," and the Imagine Dragons/Kendrick Lamar "Radioactive" is #19.