KEYBOARD'S FAMILY 

 

KEYBOARD

 You can use paper to tape octave numbers as picture below. The most important thing is the middle octave must be number 6 (regardless how long is your keyboard). Octave orders increase to the right and decrease to the left.
You can use erasable markers to write notes for each octave "cdefgab" with different colors to make learning easier.

HARP

ACCORDION

MELODICA