Yes, you read that right, Baauer's "Harlem Shake" entered the Billboard Hot 100 at #1 today. That "Harlem Shake" meme came at the right time. Billboard recently made some changes to the Hot 100, as they explained:
Billboard and Nielsen have revealed that U.S. YouTube video streaming data has been added to multiple platforms, which includes an update to the formula for the five-decade-old Hot 100. YouTube streaming data is now factored into the chart, enhancing a recipe that includes digital download track sales (and physical singles sales), as tracked by Nielsen SoundScan, as well as terrestrial radio airplay, on-demand audio streaming, and online radio streaming, as tracked by Nielsen BDS.
Due to this recent change, "Harlem Shake" became just the 21st song to debut at #1 on the Hot 100, and is the only track to debut so high from an artist who was basically unknown before entering.