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If you look at the first row ("Free"), you'd see you are booting from your USB (or CD media). And that tells you it is 100% full (another way of saying it's a read only filesystem).
If you have already installed Snakeoil on the 120 GB SSD (I think you did), remove the boot USB stick from your computer, and then turn on the computer. When you look at the music tab again it should show /dev/sda1 mounted as /. and your free space should be < 100%. And then everything should work.
Snakeoil Operating System - Music, your way!