Why the different file sizes?

Can anyone tell me why some songs are in the 20-30MB range, and most are only 3 or 4MB range? And more importantly, is there any way to shrink down the big ones? They make the CDs I burn very short indeed.

The file size of your imported songs will depend on your import settings in iTunes. An individual file size of 20-30mb sounds like you are importing in WAV or Apple Lossless. mp3 or AAC will have the same file size when using the same bitrate. For example, the average 4 minute song imported in AAC @ 128 kbps will have a file size of 3-4mb.

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