What is the easiest way to download MP3 from YouTube?

One of the easiest ways is by using an online converter like Flvto. First, go to YouTube and copy the link of the video that contains the audio you want. Next, open the Flvto site and paste the link into the search field. Choose the MP3 format and start the conversion. When the process is complete, you can download the MP3 file directly to your phone or computer.