Not necessary to wait for them to provide it, you can use a site to convert it to mp3. Here you go, this is a link to Dirpy and you click on "Record Audio" and wait for it to download to your pc.
If you're afraid of installing dodgy looking extensions or apps, you can use a site called dirpy to download the videos which have been region blocked. Then you can guarantee that you have the video after cbs decides to delete it as well.
I use http://www.dirpy.com/ They finally went mobile, so just type it into your Web browser and save it to your home screen. It works with youtube and soundcloud links. Sorry about my link too. I'm mobile.
Well you have the youtube videos so you could run them through Dirpy to get the MP3 the artist will get no money out of it but if there are no other options its what I would do.
Eh, wasn't worth the effort. Fuck them for putting a copyright lock on it. You can just download it from Youtube here: http://www.dirpy.com/studio?url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DQDDLgZYpViY#video_format
Dirpy! It even lets you choose a start and end timestamp for your audio snippet.
*ahem* And the only thing wrong with it is that you can use it to download music from Youtube, which is illegal!
I can't understand exactly what you are wanting to do, but if I get it right you can download the video as a MP3 using a tool such as dirpy, and then use a video editor to apply it over.
But beware of copyright infringement.
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There's a thing known as streaming a video. Youtube streams videos, and if it downloaded every single video put in watch later, that would be laggy.
If you want to, you can manually download the video using a service such as dirpy, and play it back manually.
what a cool idea. by the way, here is a website that will let you download the audio to put it in an MP3 player. click the blue "record audio" button and download.
http://www.dirpy.com/studio?url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DDydIK14AvXI#filename
EDIT: holy shit!! this is a 12 HOUR video. I thought it was a 12 minute vid. LOL whoa, i don't know if i will download this after all. give it a go if you are brave. set the MP3 kbps from 265 to 128 kbps to get a smaller file. :D