Free trial 

Software::Home & Education::Music

Price free to try,$4.49 to buy

Teaches these essential chord topics: Simplifying chord names, explanation of Roman numerals, why chords are built in thirds, the forbidden interval, the indispensable ii-V-I, chord melody intro, most powerful chord movement, arpeggios in soloing and more. Three guitar lessons valued at over $45 for less than the price of one.