The diatonic western kalimba tuning which Tracey used was practical for a worldwide instrument—with hundreds of African kalimba tunings, the chosen Western standard would maximize the number of people who would immediately connect with the kalimba. The practicality of this note arrangement, with notes going up the scale in a right-left-right-left progression, is that modal 1-3-5 or 1-3-5-7 chords are made by playing adjacent tines. If chords are played in the lower octave, the same notes will appear on the opposite side of the kalimba in the upper octave, which makes it very easy to simultaneously play a melody in the upper octave and an accompanying harmony in the lower octave. So, the arrangement of notes on the Hugh Tracey kalimba (and on virtually any kalimba that copies the instrument) makes certain complex musical operations very simple.