Indirectly that is correct. When you stream something it downloads the file to your PC in the background whilst you listen (or view) in the foreground. Audio files are smaller than video so they download quicker and thus don't use up so much of your allotted space.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.