Premise: "Sultans of Swing" is a song by British rock band Dire Straits from their eponymous debut album, which band frontman Mark Knopfler wrote and composed. Although it was first released in 1978, it was its 1979 re-release that caused it to become a hit in both the UK and U.S.
Hypothesis: Dire Strait's eponymous debut album featuring "Sultans of Swings" sold 2 million copies worldwide upon it's re-release in 1979.