Although YouTube does not allow songs to be uploaded without an accompanying visual element (e.g. picture or video), you can easily download just the audio from a YouTube video by using an online audio-video converter. Websites like CatchYouTube.com, Video2MP3.net and Media-Convert.com allow users to copy and paste the desired YouTube video's URL into the appropriate field on their website, and will retrieve and convert the audio automatically. Once conversion is complete, users can download their audio, free of charge.
Launch your Web browser and direct it to the YouTube song you want saved to your computer.
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Open a new tab or window and visit CatchYouTube.com.
Copy and paste the YouTube song's URL into the "URL" field at CatchYouTube.com.
Select the ".mp3" or ".wav" convert option, located in the "Convert To" box.
Click the "Convert & Download" button and wait for CatchYouTube to prepare the file for conversion and download. (This may take a couple minutes.)
Click the "Download" button that appears once the file has been converted to download the audio file to your computer.
Direct your Web browser to the YouTube page with the song you want to download.
Highlight the page's URL. Right-click the URL field and select "Copy."
Right-click the "Video URL" field in the middle of the page and select "Paste."
Click the "Convert" button next to the "Video URL" field and wait for the site to download and convert your file. (This may take several minutes, depending on the length and size of your file.)
Press the "Download MP3" button that appears once the video has been converted to download and save the audio to your computer's hard drive.
Open your Internet browser and locate the YouTube page with the song you want saved to your computer. Copy its URL at the top of the page.
Open a new Internet tab or window and visit Media-Convert.com.
Click the "Conversion From URL" tab near the top of the screen.
Paste your YouTube URL into the "File" field.
Select the "Flash Video (.flv)" input format from the list of options on the right side of the screen.
Choose "MPEG 1/2 Audio Layer 3 (.mp3)" or one of the other audio formats from the "Output Format" drop-down box in the lower-left of the screen.