How to download only audio component in a video file?

I wonder if it is possible to download/save only the audio component in a video file that is uploaded on popular sites like youtube, googlevideo etc.?

Many a times, if the video file is too large and would occupy much space on the disk, I would prefer to download only the audio part. This is particularly applicable to songs and music videos uploaded on these sites.

Thanks.

By: aks

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Business Marketing