"I think it will make for a really haunting effect, actually," Ibrahim said. "I'm curious to see how it's going to piece together. ... I imagine it's going to have a haunting, zombie like [feel], with people on their bikes making sounds."

This kind of performance art is nothing new for Sacawa and Spangler, either. For the past three winters, Sacawa has organized a holiday performance of Phil Kline's Unsilent Night, where a large number of boom box-toting participants take to the streets. The result is a cacophony of sounds, which can echo off the buildings and down the street.

Spangler teaches a sound class at the Maryland Institute College of Art. As part of a class project, every semester he and his students pick an area to record sounds, put the recordings on a boombox, hide it in a public space and hit 'Play.'

"Guerrilla sound art creates a magical experience for unsuspecting audience members in a public space," Spangler said. "It's also music that's in a dialogue with the surrounding soundscape."

Though Spangler and Sacawa might have plenty of experience doing guerrilla sound events on their own, this is the first time they've done this kind of performance as an official Mobtown Modern concert, Sacawa said. In fact, it's the first in a yearly series they're calling the Summer Spectacle. Much like Eine Brise, next year's event, while still under wraps, also has a large cast of participants.

"It involves 80 trombonists," Sacawa said with a laugh. "We'll have to start rounding them up now."

Artscape highlights
With scores of performances and exhibits, this year's Artscape Festival has plenty to see and do. Here are five events you don't want to miss.

Sondheim semi-finalists

See works by the 25 semi-finalists, who vied for the $25,000 Janet & Walter Sondheim Prize. The pieces will be on display at the Decker and Meyerhoff galleries of the Maryland Institute College of Art, 1300 W. Mt. Royal Ave., during the festival weekend.

Billie Holiday Vocal

Competition, 12 p.m. July 19

In this annual singing competition, 10 semi-finalists show off their mastery of Holiday's unique vocal delivery at the Meyerhoff Symphony Hall, 1212 Cathedral St.

Dionne Warwick, 8 p.m. July 17, main stage

Warwick, one of the more successful female singers of the past 50 years, is a veritable legend of R&B. Here's a chance to see her perform - free of charge. The main stage is near the intersection of Cathedral Street and Mount Royal Avenue.

DJ Culture at the Windup Space

This year, the Windup Space, 10 W. North Ave., hosts more than 15 DJs over the course of July 17-18. The list of performers includes King Tutt feat. Ultra Nate, DJ Booman, Will Eastman and more.

The Play's The Thing

The Theatre Project, at 45 W. Preston St., is a hub for Artscape plays, live poetry and other performances. Artists include Drop 3, Diane Ligon's Puppet Theatre, The Missoula Oblongata and more. Many of the productions center on the works of Edgar Allan Poe.

•For more information about Artscape and a full roster of this year's events, go to artscape.org.