Yes, i also agree Torch browser is perfect to download videos and you can also see audio over there. Youtube to mp3 at 9 converter. It can download youtube to mp3 and next you will be copy it to your USB

The biggest video streaming site in the world that even offers live events for users to stream and comment on. Read on how to use 9Converter as a YouTube Downloader

I personally use these websites to download and convert youtube videos :

Use  website https://9converter.com/, there are dozens of them...