BIKE riders in New York have a secret, a communal understanding about  the pleasures of navigating the urban landscape, flowing through traffic  and observing the city in a way that pedestrians and drivers can’t.  That secret is often expressed in a smile or a nod to another rider  while passing on a bridge or stopped at a light, a conspiratorial  acknowledgment of a shared moment with strangers in a city that can seem  impervious to them.
 Now there is a new piece of interactive theater to take advantage of  that feeling. Joyride  is a group bike ride with a shared route and a common soundtrack.  Riders equipped with MP3 players and headphones set off from the same  point, pushing “play” simultaneously. They travel individually or in a  pack, but each knows what the others are hearing. Gliding through the  city on two wheels can already feel like being in a long tracking shot  in a very personal movie, especially if you do it while listening to  music. Joyride gives that experience an added dimension — an audience of  participants.  
 “I like riding my bike and listening to music, and I thought it would be  great to do that with other people,” said Liz Sherman, the theater  director who came up with the project. “I thought it would be theatrical  without needing to have a narrative or actors.” The sights and scenes  of the city — what Ms. Sherman called “the ephemeral of the everyday” —  provide the set, and sometimes the drama.  
 Joyrides have proved a natural match for  Summer Streets, the city program  that shuts Park Avenue and connecting streets to car traffic, from the  Brooklyn Bridge to Central Park, mitigating the potential danger of  riding while listening to music. (Legally, riders are supposed to wear  only one custom earphone.) Ms. Sherman limits participation to 50 people; most  spots for the ride on Saturday, the last day of Summer Streets, are  spoken for, but there are cancellations, and she reserves 15 places for  people who e-mail her through joyrideo.com  with a good argument about why they should be let in. (Hint: mentioning  the avant-garde French director Ariane Mnouchkine of Théâtre du Soleil, whose work inspired  Ms. Sherman, doesn’t hurt.)  
 There’s more to Joyride than just a leisurely bike ride, though. There’s  a picnic in Central Park, complete with checkerboard tablecloths spread  on the grass, bouquets of flowers and a menu of lobster rolls and fresh  corn salad, courtesy of Jane Park, a friend of Ms. Sherman who is also a  chef. Ms. Sherman said it was integral to her vision to have all the  participants meet. “Jane and I talk about it as the second act,” she  said. “If everyone just rode and listened and then drifted away, it  wouldn’t be right.” (Thanks to sponsorships and donations, Joyride is  free.)  
 And there is the soundtrack, supplied by Duncan Bridgeman, a composer  responsible for “1 Giant Leap,” a multimedia  project in which artists from around the world build on the same pieces  of music. Ms. Sherman and Mr. Bridgeman choreographed the Joyride  soundtrack to match the surroundings, “depending on where we were during  the ride,” she said, adding that at times “we wanted something that was  more expansive or something that was more internal or something that  had a great vibe, or something whispered in your ear.” The finale  includes a bit of dialogue spoken by the yogi Bhagavan Das that, when  timed right, proved powerful to some listeners. (No oms, or spoilers,  here.)  
 Last week’s ride drew an assortment of New Yorkers, a few out-of-towners  and a parrot, Raymond. “She hangs on with one foot on my collar, and  holds onto my ear if it gets rough,” said Jan Peterson, 55, who nimbly  rode with the bird on his shoulder.  
 David La, 31, who lives on the Upper West Side, did the ride as a  tribute to the friend who got him into biking and died this year. “I  loved it,” Mr. La said. “You would see some people bobbing their heads  or sort of dancing on their bikes, and you knew exactly what beat they  were listening to,” like “50 mobile clubs listening to the same D.J.”  
 Natalie Brill, 25, a nurse who is new to New York, participated after  riding the Summer Streets route by herself the week before. “It was a  much fuller experience,” she said. “You really connected with people,  even though you weren’t talking. And I loved riding with that parrot.”  
 Ms. Sherman, who did a workshop for Joyride on Governors Island last  year, is now hoping to take it to other cities — San Francisco has been  discussed, and she dreams of Paris in the fall, for its Nuit Blanche festival.  As a performance, she still considers it a work in progress.  
 But as an experience, most bikers thought Joyride delivered.  
 “It was probably the best bike ride I’ve ever had,” said Beverly  Karabin, 51, a nurse practitioner and regular cyclist — she was decked  out in Spandex — visiting from Toledo, Ohio, on her first trip to New  York.  
 Caroline Park, 25, a tattooed Brooklyn bartender and daily rider, said  she bike-danced “awkwardly” during the ride. But she gave it even higher  praise. “I’m usually really, really aggressive and generally really  upset at the world and New York traffic,” she said, “and I didn’t think  about that at all.”  
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