Top 20 Songs In Digital History

All 20 of these songs were released in the last 40 months, which makes sense. This is the period in which digital song sales have exploded. The oldest song on the list is "Apologize" by Timbaland featuring OneRepublic, which was released in April 2007. The newest is "TiK ToK," which was released in October 2009.

18. Miley Cyrus, "Party In The U.S.A.," 4,105,000. This summer anthem was #2 for three weeks, beginning in August 2009. It was the teen star's fourth top 10 hit, following "See You Again," "7 Things" and "The Climb." Cyrus, 17, is the youngest artist on this list.