Eagle Rock EntertainmentBachman & Turner, the new group led by Bachman-Turner Overdrive's Randy Bachman and Fred Turner, have been bringing their classic '70s rock tunes to stages around North America this summer.  Meanwhile, fans will be able to see the band on the big screen starting on Friday, when the new Will Ferrell-Zach Galifianakis comedy The Campaign opens across the U.S.  Bachman & Turner make a cameo in the flick, performing the enduring BTO hit "Takin' Care of Business" at a political rally for Ferrell's character, a long-term congressman named Cam Brady, who is using the tune as his campaign theme.

Speaking recently with ABC News Radio, Bachman reveals that three different incarnations of the song appear in the film.

"It's played once by a college marching band, like [a] going-to-the-football-game kind of thing," explains the singer/guitarist.  "And then there's the real BTO version. There's [also] the version Turner and I did, where Will Ferrell joins us playing the Ztar, the keyboard around his neck, singing, 'cause his fight song is 'Takin' Care of Business.'…It looks really great."

Bachman also notes that his experience filming his band's brief scene gave him "such a new respect for actors."  He reveals that to capture what he estimated to be about three minutes' worth of camera time, the shoot "started at six in the morning [and] ended at two in the morning."

In addition, Bachman says he was very impressed with Ferrell and the other actors' ability to deliver believable performances while having to repeat their lines again and again.

"It's just really amazing," he declares.  "Anybody can act like an idiot or a killer, but to do it over and over and over at the same intensity, the same look, every single time, that's what acting is…And Will Ferrell is just really phenomenal."

Meanwhile, Bachman & Turner have a handful more U.S. tour dates scheduled this year, all of them in September.  The band's itinerary winds down with a September 29 show in St. Louis.  The group is promoting its companion concert CD, DVD and Blu-ray, Live at the Roseland Ballroom, NYC.

Bachman also tells ABC News Radio that BTO fans will have something special to look forward to in the coming month, as the band is preparing a 40th anniversary box set.  He says among the gems that he's planning to include in the collection are extra performances from the concerts documented for Bachman-Turner Overdrive's 1977 BTO Live! -- In Japan album.

Explaining why some of the songs were left off of the original record, Bachman notes, "When we put out Live! -- In Japan, [we were] dealing with one piece of vinyl.  Well, our songs then were, like, five, six, seven minutes long.  You're doing long guitar solos forever.  You're trying to be Jeff Beck [or] Jimmy Page.  So we [could] only put three or four songs a side on that vinyl."

No word yet on a release date for the box set.

Copyright 2012 ABC News Radio