The song "Shelf" is off the Jonas Brothers

Jonas Brothers

The Jonas Brothers are an American boy band. The band gained its popularity from the Disney Channel children's television network. From the shore region of New Jersey, the band consists of three brothers: Paul Kevin Jonas II , Joseph Adam Jonas , and Nicholas Jerry Jonas...

 third studio record A Little Bit Longer

A Little Bit Longer

A Little Bit Longer is the third studio album by the American pop rock band the Jonas Brothers, and their second album released on Hollywood Records. It was released on August 12, 2008. The album received generally favorable reviews, and four star reviews from Rolling Stone, Allmusic, and Blender....

.

The song is written from the point of view of a teenage boy who got his heart broken by the popular girl in school/ girl next door and now he can publicly announce it.

The intro is sung by the lead singer and middle brother Joe Jonas

Joe Jonas

Joseph Adam "Joe" Jonas is a Pop American singer, musician, actor, and dancer. He is a member of the Jonas Brothers, a pop-rock band made up of him and his two brothers, Nick and Kevin...

. The song starts off with electric guitar, and then strumming, and drum. The chorus is Nick Jonas

Nick Jonas

Nicholas Jerry "Nick" Jonas is an American singer-songwriter, musician and actor best known as one of the Jonas Brothers, a pop-rock band he formed with his brothers Joe and Kevin. The Jonas Brothers originally started as an attempted solo singing career for Nick, but the record producer liked the...

 singing a line or two and Joe singing a few lines and then singing together. Then Joe takes over for verse two. Going back to the chorus Nick takes over and they sing a bit together.

Other uses

The song was used in their first EP "Jonas Brothers: Live at Soho

ITunes Live from SoHo (Jonas Brothers EP)

iTunes Live from SoHo is the second EP from the pop-rock band the Jonas Brothers. Various artists have also an EP ITunes Live from SoHo, the Jonas Brothers recorded theirs 24 February 2009....

.

Charts

Chart (2009)	Peak position
U.S. Billboard Hot 100 Billboard Hot 100 The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...	100
U.S. Billboard Pop 100	80