What's a good iPhone app that allows you to mash up music?

I'm getting married on June 20, and for our first dance my fiancé and I want to do a fun surprise dance. We want to start out with a slow song, then fade into different faster, fun songs. Is there an app that will allow me to choose what parts of each song to put together and in what order?

Try the free and amazing AUDACITY:

And, get the LAME plug-in on the same website, if you want to save as ".mp3" files.

TIP: "Copy-protected" files may, or may not, be "editable" due to DRM legislation, and this has nothing to do with Audacity, or any other Audio-Editing App.

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