Download the audio from YouTube, import into iTunes, click on song info, determine your start and end points, create AAC version, right click on show in Finder, change extension to .m4r
Download the audio from YouTube, import into iTunes, click on song info, determine your start and end points, create AAC version, right click on show in Finder, change extension to .m4r
Or...install Soundflower and use Quicktime Player to capture the sound (just as much as you need) from the website. Edit with Audacity or similar. Quicktime Player for screen and audio recording is a good trick to know.