May be worth a go, an online app that converts youtube videos and the like to any format you like. You can only do 10 a month before you have to subscribe, but for the odd must have video it could be worth it.
I’m going to investigate this further, it is a wordpress plugin that shows your favourite youtube clips embedded in a gallery on your blog. Could be an interesting little thing to have set up
[Download] [Plugin Page]
I found this looking for the original last night. I had never come across the concept, which clearly appears to be a mixture of gospel choirs and competative cheerleading. I am now obsessed with finding the most obtuse track covered by a showchoir. Get on Youtube yourself and see if you can find one. Let me know in the comments any links you find!