Ardour is a digital audio workstation (DAW). You can use it to record, edit and mix multi-track audio. You can produce your own CDs, mix video soundtracks, or just experiment with new ideas about music and sound.
You can either download the stable archive, or decide to build it from the SVN : see here for information.
Download it from here, then :
$ scons PREFIX=/usr $ su -c "scons install"