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Audacity is a cross platform audio editor for Windows, Unix (GTK), MacOS 9 and X (all thanks to wxWindows). It is capable of playing and recording, importing and exporting many common formats including Ogg Vorbis, editing an unlimited number of tracks, and is optimized to make common operations like undo and redo extremely fast. Features include effects filters, noise reduction, and unlimited undo.
Audacity short tutorial
http://www.daniel.uklinux.net/tutorial/
This is a short tutorial that you can follow on your own machine, which should leave you with a complete music track.