A very tiny bit, I think. Just guessing, but you could probably store 1000 seconds of MP3-compressed silence in less space than you could store 1 second of true audio.

Actually, with constant-bit-rate MP3 files, silence takes up the same amount of disk space as sound. Each frame is a fixed size, and represents a fixed amount of time as well.

I assume variable bit rate files would drop the bit rates to very low thresholds on silent frames, resulting in smaller frames for the silent parts. But the difference between such frames and the normal-music frames isn't as large as 1/1000.

MP3s aren't exactly like zip files in that respect. The original design was for streaming audio with a relatively constant bit rate.

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Tony Fabris