This is so cool. Very helpful for musicians. Helps a lot with guitar chords/ scales because it shows intervals visually on the piano.

Quoted: Finger settings for any piano chord. Easy to use, fast, and complete. You get: finger positions, actual notes, optional notes, note names, scales, and more, all clearly displayed.

Here's some more music theory focusing on the guitar, mostly dealing with chord progressions.

Quoted: Lessons on chord progressions for guitarists. These lessons will help you to play by ear, remember tunes and to navigate the fretboard.

Another great band

An amazing band you should all check out.