Kings of Leon: Their Biggest Hits (Video)

On Monday, Kings of Leon announced they were canceling their U.S. tour because of Caleb Followill suffering from "vocal issues and exhaustion."

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And now much is being made of the band's lead singer, who abruptly exited a Dallas stage in the middle of a July 29 concert, as being the root of the problem. His brothers (and bandmates) Jared and Nathan even took to Twitter to air their disappointments with the situation (and allude to more serious issues than exhaustion). 

Caleb also commented on the situation, saying "I'm just trying to get better." 

Since most Americans won't be seeing the band perform their popular songs anytime soon, here's are their 5 most popular music videos. 

1) "Sex is On Fire" In 2009, the single toppled Leona Lewis' "Bleeding Love" to become the highest-selling digital download in the U.K, and has gone platinum three times. It also won the band it's first Grammy for Best Rock Vocal Performances by a Duo or Group the same year. 

2) "Use Somebody" The song, which won a Grammy for record of the year in 2010, was ranked by Virgin Media as the fourth most downloaded song of all time. 

3) "Crawl" The second track off of their 2008 album Only by the Night, it was released as a single in October 2009. 

4) "Radioactive" The first single off of their 2010 release Come Around Sundown, the song became their fourth No. 1 hit on the Alternative Songs chart and was nominated for two Grammys in 2011 (Best Rock Performance by a Duo or Group with Vocals and Best Rock Song).

5) "Pyro" The second single from Sundown, this song, released in January took on an ironic feel after news that the band's tour busses caught on fire in London in December 2010.