In a preferred embodiment, there is provided a two tier chromatic thumb piano of separate sets of elongated finger members for each set ranging in lengths to produce a tonal scale of even increments, with one set's tones being adapted to fall equally intermediate of tones of finger members of the other set, the finger members of both sets from their respective tier supports extending in a common direction for adjacent finger members and for adjacent sets along an elongated upper surface of substantially hollow sounding vessel structure having an enclosed space defined therein with an opening in the upper face as an enlarged hole, and with spaced-apart small-hole apertures in the underside face of the vessel structure, the finger members of the upper and lower tiers being commonly braced into fixed and anchored positions and states by a single unitary clamping element screwed onto an upper face of the vessel structure and having a series of adjacent slit apertures therein clampably receivable of the respective finger members, one finger member per slit for the higher tier set and one finger member from the lower set -- two slits per finger member with the slits aligned one behind the other along the elongated axis of the respective finger member, such that the unitary clamping element clamps each finger member between two spaced- apart fulcrum points, thereby securing the finger member.
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