The following article shows you how to download videos from YouTube and convert YouTube video to MP3 on Mac OS X (including Snow Leopard) using Clone2Go Video Converter for Mac.
Step 1. Download YouTube Video
Download the latest version of Video Converter for Mac, install and run it.
Click the icon in the interface of the program. Then you can start to download and convert YouTube videos in the pop-up "Clone2Go YouTube Downloader" window.
Step 2. Select output format: "MP3 - MPEG Layer -3 Audio (*.mp3)"
After the downloaded videos are imported into Clone2Go Video Converter Professional, go to the "Output" panel. Click the "Profile" drop-down list to choose "MP3 - MPEG Layer -3 Audio (*.mp3)" as the output format.
Step 3. Start converting
When all settings are done, click the "Convert Now" button to start convert YouTube to MP3 format.