Our Lady Peace's Raine Maida has sung in public with his wife before -- but he says he may even rehearse before he takes the stage with Chantal Kreviazuk tomorrow.

"It's not something we often get a chance to do," says Maida from Ventura Country, Calif., where he, Chantal and their dog have been on a creative hiatus for the past six weeks.

"We're not often performing in the same place, so I will probably get up and play a couple of songs with her. I've done it a couple of different times, on the spur of the moment, but I'm actually going to her rehearsals this week so that it sounds good up there."

That Maida and Kreviazuk will get the opportunity to perform together on behalf of War Child Canada is a natural extension of their involvement with the aid organization, which began when Chantal was approached to play at last year's concert, an event that drew a reported 80,000 people to The Forks to see her, Maestro, Angelique Kidjo and The Tragically Hip.

The singer/songwriter says it was his wife who spurred his enthusiasm for the cause.

"Chantal was then asked by someone at MuchMusic to go on a trip to Iraq with War Child and she approached me with the idea when it became a firm thing. We ended up going to dinner with (War Child co-founder and executive director) Samantha Nutt and we were just so impressed by her infectious spirit, the things that she's done and just the incredible passion that they have.

"It just became an exciting thing for us to do."

Kreviazuk echoes her husband's statements, saying that War Child, which aids children in war-torn countries, is an organization that meshes with her own views of the world.

"I'm really very passionate about War Child," Kreviazuk says. "I like the idea of living outside the box and connecting to the larger world around us. I feel richer for having been involved with War Child and I have to say I'm going to be involved for the long haul."

Kreviazuk says she often takes time in her concerts to speak about the organization.

"On the song Blue, which breaks down into a quiet passage, I've been talking for five or 10 minutes about how much opportunity we have to be well and to help others be well," she says.

"It's a very important subject to me."

Maida says his band has performed at many charitable events but that his inclination is to basically stick with music.

"For me, I think most people there will know that it's a War Child show and I don't know if there's much that I can say. Hopefully, the fact that there will be 40,000 or 50,000 people there means that maybe 1,000 of them or so will actually go to the Web site (www.warchild.ca) and become more involved. The people that have the motivation will get hooked, I think," he says.

Apart from preparing for this weekend's show, Maida and Kreviazuk have been using their vacation to get back into "creative mode," playing and writing music with and for each other. Both have their minds set on upcoming recording projects.

Kreviazuk is due to record her third album soon (and may reveal some new songs during her set tomorrow), while Maida says that OLP is hitting the studio in a couple of weeks to lay down some tracks.

"Our thing now is to work with a bunch of different producers, getting different experiences and different feels. We don't want to go in to the studio again with just 12 or 13 songs and say 'This is going to be the record,' " he says. "We want to write a few, then record a couple at a time. I find that much more challenging, and it enables me to get music out of my system.

"I can't go around with more than 20 new songs in my head at once. I have to get them out."