Linux audio. If you're a musician, start recording yourself. There's a world you haven't explored. Install a minimal then xfce4, QJackctl, Rosegarden, QSynth, Fluidsynth, Hydrogen, Audacity, and there are many others to fiddle with. That will keep you going for sometime. I know it will me.
Grab a cheap old audio interface (I have an eight channel PCI card type one on the desktop with eight analogue inputes, midi in, out and through, and a Digidesign MBox 2 Mini on the laptop which can be procured for $100 or less nowadays and works 'out of the box' in the newer Ubuntus).