Buzzwords, De-buzzed: 10 Other Ways to Say mp3 converter
https://www.minds.com/arnhed1pwk/blog/download-famous-music-from-youtube-on-mac-1015941664269742080
You can straight drag the files to the program or click "File" icon on the tool bar to import files. Remember that as the quality of the video progresses, the longer the downloading time will be.