Making it your own
I can't wait to see how you design your guitar and how you play it. Here are a few other ideas that you could use to make your own custom guitar.
You could use the purple sound play sound block and import your sounds. Using the record… option, you could play power chords from the internet and record them to your Intelligent Hub. Using edit sounds… allows you to further customize the sound.
If you are talented, you could record yourself playing the actual chords/notes and pull that into the code:
You could also experiment using a block, such as the changing pitch block to change the pitch of a sound if the distance sensor is triggered (think of a whammy bar on an electric guitar) or if you tap the brick, or maybe add a motor to spin.
The possibilities are endless!