ChordLab helps you play, write, and distinguish musical chords. You select a chord's key note, such as B-sharp or F from a pop up menu and try out different chords by pressing buttons in the window. The symbols are somewhat obscure, but the built-in balloon help for this program is superb and explains each kind of triad and chord.
The Chord Reference eBook contain over 90 pages in printable .pdf format.
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