How to increase Audio CD capacity in Nero Burning ROM

I have Nero 2014 Version15.0.1900 running Win7.

I have always loved using "Create Audio CD" - and there's nothing wrong with it. However I now want to use that functionality to create an Audio CD on a USB drive containing 100 or more of my favourite MP3 files. But when I load the files, the capacity bar at the bottom turns red and it says it is over the target size. Any suggestions ? Thanks.
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