"Let It Rock" is the debut single of Kevin Rudolf from his debut album, In the City. It features rapper Lil Wayne. The track was produced and written by Rudolf.
In the U.S. and Canada, the song reached #5 on the Billboard Hot 100, number #6 on the Pop 100 and #2 on the Canadian Hot 100. The first week, the song debuted at number 45 on the Australian Singles Chart and eventually reached number 3. In the United Kingdom, the song climbed to number forty on physical release but due to an increase in airplay, due to BBC Radio 1 adding it to their A-list, the song climbed thirty places to number 10 in the song's second week on the chart; then it rose to number 5 the following week. "Let It Rock" was number 28 on Rolling Stone's list of the 100 Best Songs of 2008. The single was also the official theme song for WWE's 2009 Royal Rumble.
"Let It Rock" was certified Triple Platinum by the RIAA on May 5, 2009. As of July 2011, the song has sold 4,000,000 digital downloads, making it Lil Wayne's third 4-million-seller.
The music video for "Let It Rock" features Kevin Rudolf and Lil Wayne performing in front of both a crowd and a dark background, sometimes lit with various effects such as strobe and laser lights. The NBA on TNT features a version of the music video to promote the 2009 NBA All-Star Game featuring the players competing in the event.
The song's chorus is sampled in the Iyaz song "Damn They Hot", which features Rudolf himself. The song is also sampled and incorporated into Natasha Bedingfield's song "All I Need" from her album Strip Me; this song also features Rudolf.