Teen singer Justin Bieber poses with his pre-haircut locks backstage at the 53rd annual Grammy Awards in Los Angeles, in February. Mario Anzuoni/Reuters
Teen actor Zac Efron arrives at the ESPY Awards on July 16, 2008 in Los Angeles. He's appeared in all three High School Musical movies. Matt Sayles/AP/File
The Jonas Brothers show off their teen hair at an Angelina Jolie campaign held in Hollywood, CA in Sept. 2010. Newscom
Michael Jackson poses here on his 1982 album,Thriller. NewsFoto
Elvis Presley is shown with his Gibson J-200 guitar in this 1957 MGM photo. AP/File
Frank Sinatra is shown in a 1943 photo. The FBI opened its files Dec. 8, 1998 releasing more than 1,200 pages of documents on Sinatra. AP/Columbia Records/File
This 1972 photo shows singer, actor, songwriter, and teen idol David Cassidy. Cassidy played Keith Partridge in the muscial sitcom, The Partridge Family.
Davy Jones, vocalist of The Monkees, a pop rock group and TV show that aired from 1966 to 1968. This photo was taken in January 1970. Newscom/File
The Beatles pose in an unknown location, in this Feb. 28, 1968, photo. From left are Paul McCartney, John Lennon, Ringo Starr, and George Harrison. AP/File
The Rolling Stones are shown during rehearsal on April 8, 1964 at an unknown location. The British band members, from left, are, Brian Jones, guitar; Bill Wyman, bass; Charlie Watts, drums; Mick Jagger, vocals; and Keith Richards, guitar. AP/File
American Music Awards: Justin Beiber (favorite pop/rock male artist), Nick Minaj (favorite rap/hip-hop artist), and Taylor Swift (favorite country female artist). Other American Music Awards winners included Carly Rae Jepsen (favorite new artist) and Carrie Underwood (favorite country album).