The document provides an introduction to basic music theory concepts like notes, scales, chords, and harmonizing notes. It explains that the A note vibrates at 440 Hz and is used to tune pianos. It also describes how playing notes that are 3 notes apart on the scale, like C and E, creates a pleasant harmony. Playing 3 harmonizing notes together, such as C, E, and G, forms a major chord. The document then discusses how to play simple chords and melodies using a harmonica in the key of C or G. It provides instructions for tongue blocking and lip positioning when playing single notes on the harmonica.

1. How to play like a professional… if that professional only knew how to play one note.

5. Straight Harp Example.