Singer Bruno Mars and adult contemporary stalwarts Train will headline this year's Preakness InFieldFEST, the Maryland Jockey Club announced today.

The bill represents an extra shot of star power for the event, now in its third year.

Headliners in the past included O.A.R., Zac Brown Band, ZZ Top and "Crazy Bitch" band Buckcherry.

Mars, on the other hand, won a Grammy earlier this year for best  male pop vocal performance.


He is currently on a Spring tour with singer Janelle Monae that was scheduled to skip Maryland.

Train, known for song "Drops of Jupiter," also won a Grammy earlier this year for best pop performance by a duo or group.

The performers will take the main stage at the public Infield of Pimlico Race Course Saturday May 21.

In addition, there will be a second stage that will feature band Puddle of Mudd, Phil Vassar and Mr. Greengenes, who are scheduled to make several St. Patrick's Day appearances locally. That stage will also host a bikini contest, the Jockey Club noted in its press release.

The festival is the Jockey Club's attempt to organize the infield experience, which before 2009 had a reputation for its rowdiness. In 2007, some attendees dashed across the tops of portable toilets while others pelted them with beer cans.

"The Running of the Urinals" has been saved for posterity on YouTube.

Instead of allowing attendees to bring their own beer, the Jockey Club in 2009 instituted the Mug Club, which allows fans to buy a bottomless beer mug for $20 in addition to the admission price.

Tickets for the event, which start at $40, went on sale in February, and are being sold at ticketmaster.com or at the Preakness Ticket Sales Office.

This will be the 136th year for the Preakness Stakes, the middle jewel of the Triple Crown.

Photo: Bruno Mars at the 2011 Grammy Awards (AFP/Getty Images)