Other than improving my programming skills and learning a bit more computer science theory in general:
1. Music. Learning to play the piano
2. Drawing and Painting
3. Cooking
1. Music. Learning to play the piano
2. Drawing and Painting
3. Cooking
Stepping through the first quarter of this book, following the exercises and going from being able to draw a barely recognisable stick figure to an actually respectable drawing within 50 pages was an amazing experience.
It will help you understand these terms in music and art more naturally while at the same time being easier to get started with (i.e. you have the skills necessary to create a dish more than to play the piano and draw)