Originally posted by LensBeginner DSLRs aren't really made for continuous video recording, the sensor heats up pretty fast.
Be sure to turn recording off as much as you can, and try to capture 5' at a time tops.
There should be a limit of about 15-20' continuous recording depending on the model, so check the manual.
I've shot for hours with my K-5 without a break, and my K-5 has an older, hotter sensor plus shake reduction which adds to the heat. I wouldn't be too worried about recording long takes, and plenty of them.
Bring a tripod, turn off Movie SR, because it is evil, and terrible, and did I say it is evil? It will badly screw up your video.
The GoPro is great for being left alone on a, well, anything, really, while DSLRs are better for things like close ups etc. However the issue with SR remains... there is no stabilization in the K-3 (K-7 and K-5 yes, K-r or whatever the entry level one was that records video too). If you have one of those old cameras, reactivate it. It's better than the K-3. Not sure how you'd go about doing close ups without SR, maybe on a tripod?
If you can do several gos of the drum track that'd be great, however the drummer needs to play pretty much the same thing again. No improvisation allowed.
The audio was recorded, but lost before it reached me, so I had to sync it up to the CD. It was a nightmare, every few seconds I'd need to cut and resync. It was shot using a Pentax K-5 with a 50mm (moving the camera around), a Sony NEX-5 (shooting from the left, on a tripod... and this camera did overheat, while my K-5 didn't) and a GoPro 2 Hero shooting from the right (the fisheye lens...).
Ideally you don't stop recording with each of those cameras. If you want to shoot from a different angle etc., just let it roll while you move the camera. That way you only need to sync once. Just cut away to the GoPro for example when you're moving the camera.
If you're shooting with multiple cameras, try matching up white balance and exposure as much as possible, try to match up the image profile, etc. All of that is going to make editing so much easier and make it look better.