Norah Jones performs at the Cemil Topuzlu open air theater during the 14th International Istanbul Jazz Festival in Turkey on Aug. 1, 2007.
Credit: AP Photo/IKSV
Jack White of the White Stripes performs at Madison Square Garden in New York on July 24, 2007.
Credit: AP Photo/Stephen Chernin
Pink performs during the Paleo open air music festival in Nyon, Switzerland on July 26, 2007.
Sting performs with The Police at Madison Square Garden on Aug. 1, 2007 in New York.
Rock legend Robert Plant, lead singer with Led Zeppelin, performs at the Paleo open air music festival in Nyon, Switzerland, on July 26, 2007.
James Hetfield sings with Metallica at the Olympic Stadium in Stockholm on July 12, 2007.
Credit: AP Photo/SCANPIX
The artist again known as Prince performs during a late-night jam session in the Montreux Jazz Cafe after his concert at the 41st Montreux Jazz Festival in Switzerland on July 17, 2007.
Anita Baker makes her first New York City appearance in 12 years at Radio City Music Hall on July 26, 2007.
John Mayer and Eric Clapton perform on ABC's "Good Morning America" show in New York's Bryant Park on July 20, 2007. The appearance was a promotion for Clapton's Crossroads benefit concert.
Credit: Getty Images/Peter Kramer
Singer Courtney Love performs in a private concert in the Hiro Ballroom at The Maritime Hotel on July 12, 2007 in New York.
Credit: AP Photo/Jason DeCrow
Al Jarreau sings at the 41st Montreux Jazz Festival 2007 in Switzerland on July 12, 2007.
John Legend performs during the 41st Montreux Jazz Festival in Montreux, Switzerland on July 8, 2007.
Faith Hill and Tim McGraw sing in Grand Rapids, Mich. on July 12, 2007.
Credit: AP/The Grand Rapids Press
Fieldy of the band Korn performs at South Street Seaport's Pier 17 on July 31, 2007 in New York. The band's appearance was sponsored by J&R Music and Computer World.
Credit: Getty Images/Bryan Bedder
Natalie Cole performs at the Torwar arena in Warsaw, Poland on July 16, 2007. The concert was a part of the Warsaw Summer Jazz Days festival.
Credit: AP Photo/Alik Keplicz
Mick Jagger, left, and Keith Richards perform on Jaz beach near the Adriatic town of Budva, Montenegro, during the Rolling Stones' "A Bigger Bang" European tour on July 9, 2007.
Credit: AP Photo/Risto Bozovic
Alice Cooper performs in the first Sydney night of his "Psycho Drama" world tour at the Enmore Theatre on July 6, 2007 in Sydney, Australia.
Credit: Getty Images/Gaye Gerard
Kevin Bacon and the Bacon Brothers perform in Baltimore at a free concert, one of a summer series hosted by Netflix.
Credit: AP Photo/Netflix
Colombian singer Shakira performs at the Kurucesme Arena in Istanbul, Turkey on July 9, 2007.