Ok, people, I tried most of these. It tells me “invalid file format” (This is the youtube link: https://video.search.yahoo.com/search/video?fr=tightropetb&p=The+musketeers+exteneded+theme#id=1&vid=29eaa807aa21bde1d289625fd5c164f0&action=view)
It gives me other error messages but this is the main one.
The URL in your post is NOT youtube - it’s a search on yahoo, and the video there is an html5 player video.
Check the bottom right hand corner of the video (while it’s playing) and click on the youtube link. Then you can download the youtube file using any of the suggestions in this thread.
Download Audacity & just record it while the YouTube video plays.
https://www.youtube.com/watch?v=A7l_QYOw3lE
You were using a URL from a search, not the actual URL of the song.