21. "Karma" (2003)
Producer: Kerry "Krucial" Brothers
Album: The Diary of Alicia Keys
This brilliant mash-up of hip-hop, haunting violin, and classical undertones was not as commercially successful as the other three singles off Keys' The Diary of Alicia Keys but that doesn't make it any less of a track. The repeated violin riff is sampled from Violin Concerto in D major, Op. 77 by Brahms, and Keys makes the most of it with deeper, frustrated vocals on the record.