Question: Hi All,

I have been looking at moving me stereo short doco films with background music to a surround experience. At the moment the design is fairly simple, interview vocals center and music as it comes from the artist (stereo). What can you guys suggest to move the music towards using a full surround experience. I am looking at subtle exposure, not over the top use of the surround stems without compromising the original quality of the music. The sound effects are more natural to mix, so I am not too fussed about them.

I hope that makes sense.

Answer: 
It depends what you're mixing in. 

Logic is easiest for surround panning as you just change the output to surround and you can use the planner to position your centre point and alter the stereo spread across the 5.1 field. This also works for auxiliary busses for your reverbs. 

Protools is a bit more faffy - you cant adjust the centre spread of the audio - only the centre positioning so the easiest way is to create 2 reverb busses for each reverb, Position 1 of them in the front 2 speakers and the other one in the back two. Copy the reverb parameters between both but slightly alter the back reverbs to compensate for HRTF and that kind of thing. Then send each track to both to create an imersive experiance, 

This is best for atmos and ambience tracks and music can be altered in the same way. 

Hope this helps!
From everything I've heard, mixing music into the surrounds is supposedly a big no-no. Same goes for mixing dialogue in the surrounds. Personally, I like mixing music in surround, and depending on the context of the dialogue, I'll mix that in surround as well I'm not one for playing inside the rules or playing it safe unless it's a QC or broadcast spec I have to adhere to. With music you gotta show the people in the back a bit of love too imo. It's not like it's a specific sound effect that will really draw the listeners attention away, so it can be done... but simply done carefully and tastefully, same goes for certain types of dialogue as well. Personally I think surround mixing still plays it a bit too safe. We have this awesome technology and a lot of mixers are still afraid to take chances and push the envelope. Some I might add, are quite amazing at this. If you listen to the surround mix for Inception Gary Rizzo mixed A LOT of music into the surrounds... for that matter it was sometimes only in the surrounds.

When mixing music in surround (which I would typically do in Pro Tools), I'll usually have it in the Quads pulled back around 10-20% from the front and I'll set my divergence to 80% all the way around, that way I'm not hitting the LS and RS too hard, it's not too wide and I'm just giving it a bit of surround space to make it a little more immersive. Sometimes I'll send it to the LFE depending on the scene and what the mix needs. I'm extra careful with that though. I don't ever use verb on the music though. If it's incidental music all bets are off and it depends on the source location of the music in the surround field. In that case I would use verb on the music. On top of that, it also helps clean up a bit of headroom in the L+R and leaves a bit more space for SFX and DX.