Linux MultiMedia Studio
If you play music, you’ll want to record it. And if you record your music, you’ll want to fiddle with the tracks for hours until you get as close as you can to creating the right sound. The LMMS (Linux MultiMedia Studio) lets you mix samples, add beats, and experiment with hundreds of other audio blending techniques before producing the final song. Distributed under the GPL 2.0 and also built for Windows despite the name.