Program to combine songs?

Does anyone know of a free program to combine and edit songs for a performance?

If you simply need a program to stitch together song sound files and do general editing of the files (like fades, compression, etc.), then Audacity is really good and completely free. If you need complex editing of the actual songs themselves then you will need something quite a bit more complex (and very likely not free).

http://audio-joiner.com/

audacity

Sure you could use free software. But why settle?
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