Audacity

Audacity is yet the most popular free music editor, and the fact that its open source means that there’s a ton of support available in the form of forums and developers.

It can be used to record audio from any input source, edit MP3/WMA/Ogg Vorbis, split and splice audio clips together, change the speed or pitch of audio, mix tracks, record multi-channel (up to 16 channels- with of course the right hardware), normalize and edit loudness, and much more.

You can undo/redo your changes an unlimited amount of steps; it’s fast, low on system resources, and has a very easy to use interface. Effects include pitch changing without altering the tempo, or changing tempo without changing the pitch, static removal, bass boost, equalizers, echo, Wahwah, Phasers and more.

It’s so much feature packed that no one but only the professionals would find that they need to do something more that audacity can’t do, but for most of us it’s more than enough. We are not going to look for more Open Source Audio editors as none of them are even half as good as Audacity!!