67. T.I., "What You Know"
Atlanta rapper T.I. hit the Top 10 with this epic, a standout pop moment for Southern trap music. Producer DJ Toomp and co-producer Wonder Arillo came up with the colossal, heart-tugging synths – which were an homage to Roberta Flack's 1970 cover of the Impressions' "Gone Away." "When T.I. heard it," Toomp said, "he had the hook in, like, 10 minutes."