I have a downloader and it is called Convert to Mp3. This is what I do when I am using it on my phone. I click the video I want to download and then I click share. Once I click share it gets me to the part when I will copy the link. I open Convert to MP3 and paste the link there. I choose an option if it is for MP3 or MP4 (video). Once I already have it, I click convert then it will start downloading. There are lots of Youtube downloader available online but this one, Convert to MP3 I have been using this since 2015 and so far the songs that it download are all complete, unlike other downloader that will give you part of the song or you can only hear the start of the song , not the whole song. The experience is good that is why I continue using it.