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         Piano Palette
     Way easier to grok than guitar.
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The guitar was invented a bit earlier than the piano.  So was the harpsichord.
In fact, stringed instruments have been around since before the dawn of
written history.  Pianos and harpsichords were invented to make it easier for
"those lacking the subtle dexterity of Olympians," to play music.  And they do.
Far, far easier.  In fact, no instrument comes closer to the quintessence of
12-tone music than the piano.  You might say it is the Mac OS of music.

Sure, we love stringed instruments for all they're nuance and direct feel.  And
lest we come to disdain the piano, remember:  It too is a stringed instrument.

Colorful Keys
Your basic piano is colored ebony and ivory which fit together in perfect
harmony side-by-side.  Colors are added to show which notes belong to your
chord.  Green keys indicate the root of the Current Chord.

The Layman's Layout
The white keys on a piano are all natural notes in the key of C / Am.  (The
black keys all belong to the F# / Ebm pentatonic scale.)  The relationship
between keys and - well - keys follows the circle of fifths:

C has no black keys.  Moving clockwise, G gains a black key (F#).  Next, D
gains C#.  This progress continues until we get to B when all the black keys
are used.  Then F# and C# have all the black keys but different white keys.
Beginning with Ab we begin to lose black keys again until we get back around
to C.

You can demonstrate this effect by using the Transpose Button.  First fill up
the C scale with the Scale Button.  Next use the Transpose Button and
click-drag up and down the Scale Palette.

Tickling the Ivories
• Click a piano key to hear a note.  You can drag too.
• Double-click to toggle a note in your chord.
• Triple-click to add a triad to the chord.
• <OPTION>-triple-click to remove a triad from the chord.