On Tour 2004

The Re-Invention Tour is the singer's first in three years. It kicks off in Los Angeles May 24, and will hit most U.S. cities, including a six-night stop at Madison Square Garden. She'll also play in Europe, with dates in Paris and her part-time home, the United Kingdom. Photo: Maddonna onstage in Los Angeles, May 24, 2004.

Ozzfest

Also making its first live appearance since 2001 is Black Sabbath, as the headliners of this year's Ozzfest tour. Other bands joining Ozzy Osborne's outdoor metalfest include Judas Priest, Slayer and Hatebreed. The 26-show itinerary kicks off July 10 in Hartford, Conn. Photo: Osbourne performs with Black Sabbath, 1997.

Simon & Garfunkel

Still singing after last year's "Old Friends" reunion tour -- their first in 10 years -- the folk rockers will be playing in the United States through June, after which they'll head to Europe. Photo: Simon and Garfunkel at the 2003 Grammys.

Rock & Soul 2004 Revue

Philadelphia pop stars Hall & Oates join fellow "blue-eyed soulsters" for this tour of mostly outdoor amphitheaters that kicks off June 23 in Tampa, Fla., and runs through October. Former Doobie Brother Michael McDonald and Scotland's Average White Band share the bill. Photo: Michael McDonald, undated photo.

Prince

The reclusive musician is back in the spotlight with "Musicology," his biggest hit in years, and a U.S. tour that runs through Sept. 9. The Prince of today is a Jehovah's Witness who won't sing his raciest numbers any more, though his musical genius remains center stage. Photo: Prince onstage in Champaign, Ill., April 10, 2004.

Metallica

The band's world tour returns to North America Aug. 16 and runs through late November. Early figures in the online music scene and the fight against illegal downloads, Metallica is selling MP3s of every performance on the Web site www.livemetallica.com. Photo: Metallica's Lars Ulrich and Kirk Hammett onstage in Las Vegas, March 13, 2004.

Van Halen

Following a brief reunion with original singer David Lee Roth and a dubious run with Extreme's Gary Cherone on vocals, "Van Hagar" is back, as the band re-teams with former frontman Sammy Hagar for a U.S. tour that kicks off June 11 in Greensboro, N.C. Photo: Alex Van Halen, Eddie Van Halen, Michael Anthony and Sammy Hagar, in 1988.

Projekt Revolution Tour

Alternative metal band Linkin Park launched this festival in 2002 to expose fans to new bands and styles of music. This year they'll be joined on tour by Ghostface, of the legendary rap group Wu Tang Clan, Korn and others. It kicks off July 23 in Cincinnati, Ohio. Photo: Linkin Park singer Chester Bennington performs, March 15, 2004.

Kenny Chesney

Last year, Chesney became the first entertainer since Michael Jackson to sell out Knoxville's 61,000-seat Neyland Stadium. The country crooner is hitting the road again this summer, with dates beginning June 3 in Tulsa, Okla. Photo: Chesney performs at the 2003 Academy of Country Music Awards.

American Idols Live

The 10 finalists from this season of the popular TV talent contest are boarding the bus for a North American tour that's cleverly sponsored by Pop Tarts. The first date is July 14, in Salt Lake City, and the curtain falls Sept. 26 in San Jose, Calif. Photo: Finalists Diana DeGarmo, Fantasia Barrino and Jasmine Trias, L-R, May 18, 2004.

Aerosmith

The Boston rockers are entertaining fans with hits from their 30-plus year career as well as songs from their new release "Honkin' on Bobo," on a tour that runs through June before heading to Japan. Power popsters Cheap Trick are special guests. Photo: Aerosmith's Steven Tyler performs during the Super Bowl pregame show, Feb. 1, 2004.

Jessica Simpson

While Jessica Simpson's summer tour is about her music, it also manages to incorporate "Newlyweds: Nick & Jessica," the MTV show that made her a big star. During Simpson's performances, a giant television mounted onstage flashes scenes from the hit reality series. Photo: Simpson at the Z100 radio station's "Zootopia 2004" concert, May 21, 2004, in New York

Eric Clapton

After several unkept "retirement" pledges, the legendary guitarist and ethereal rock star will hit the stage yet again, performing tracks from his four-decade career. The Eric Clapton Crossroads Guitar Festival runs from June 4 in Dallas until Aug. 2 in Los Angeles. Photo: Clapton onstage at Dallas's Cotton Bowl, June 6, 2004.

Usher

With his Michael Jackson-esque dance moves, soul-searching ballads and women-wooing ways, Usher's summer tour smacks of success. The tour began June 1 in Raleigh, N.C., and will run until July 7 in New Orleans. Photo: Usher at the Soul Train Music Awards in March 20, 2004.

The Vines

The Australian garage band, whose debut album "Highly Evolved" earned them comparisons to Nirvana, begins touring with fellow rockers Incubus on June 24 in Atlantic City, N.J., and closes Aug.18 in Inglewood, Calif. Photo: Craig Nicholls, The Vines' vocalist and guitarist, with drummer David Olliffe at the MTV Video Music Awards Tuesday, Aug. 27, 2002.

Sarah MacLachlan

After a 6-year hiatus, Lilith Fair founder Sarah McLachlan is back to breathe new life into her catalog and offer reflective musings with material from her new album, "Afterglow." McLachlan's tour kicks of July 5 in Seattle and closes in Minneapolis Sept. 4. Photo: McLachlan at the 46th Annual Grammy Awards, Feb. 8, 2004, in Los Angeles.

John Mayer

Now that most fans know his songs by heart (his most recent album, "Heavier Things," sold 1.7 million copies), Mayer is looking forward to changing up his set list every night. His summer tour runs from July 2 in Milwaukee until Aug. 29 in Atlanta. Photo: Mayer performs at the Mandalay Bay Events Center, Feb. 20, 2004 in Las Vegas.

Annie Lennox and Sting

Sting and Annie Lennox have a lot in common: Grammy wins, popular new wave bands, families and lucrative solo careers. Now, the two powerhouse artists are teamed up for a summer tour starting June 27 in Philadelphia and ending Oct. 8 in Seattle. Photo: Lennox on NBC's "Today" show, in New York June 13, 2003.

Norah Jones

The sultry singer kicks off her 2004 tour at Nashville's Grand Ol' Oprey on August 12. Jones' tour ends in West Palm Beach, FL. in November.