For a while, I played the MMO Guild Wars 2 as a music simulator. It has playable in game musical instruments that you can equip, and play with the number keys. A-G are represented as numbers 1-8 with 9 and 0 swapping an octave lower or higher. Killing monsters? Doing dungeons? Raids and world bosses? Nah I’m just chilling in a beautiful forested cliffside near a waterfall figuring out an arrangement for the Lord of the Rings theme.