Clad in colorful flowing robes and a sort of big-band sound with ’70s undertones, the 24-member pop band Polyphonic Spree is rocking the music scene — in their collective way. And former Frog James Reimer ’98 and his trombone are right in the thick of it.

Reimer joined the band four years ago (in time for the new group’s fourth show, held at Ridglea Theater). And since the summer of 2002, it’s been nonstop with shows domestic and abroad, their music in movies “Eternal Sunshine of the Spotless Mind” and the upcoming “Thumbsucker,” and the band itself spotlighted in TV shows “Scrubs” and “Vegas.”

Last spring the group toured with David Bowie. “He asked us to play a song called ‘Slip Away’ with him during his encore. So not only did I get to play the trombone with Bowie, we got to write the parts ourselves,” Reimer said.

More recently the band has been in LA recording with composer/producer Jon Brion, and in December they performed at the Nobel Peace Prize concert for Dr. Wangari Maathai. In January while in New Zealand, the band played in the Big Day Out Festival.

“After that, it’s a few U.S. dates, a few European dates and then summer festivals the world over. We’re planning on recording a new record after that,” Reimer said. “But most importantly, I’m getting married in March!”