The HANG: A hand played steel drum

@article{Rossing2001TheHA,
  title={The HANG: A hand played steel drum},
  author={T. D. Rossing and Uwe J. Hansen and Felix Rohner and Sabina Sch{\"a}rer},
  journal={Journal of the Acoustical Society of America},
  year={2001},
  volume={110},
  pages={2649-2649}
}
The HANG is a new steel instrument consisting of two spherical shells of steel, suitable for playing with the hands. Seven to nine notes are harmonically tuned around a central deep note which is formed by the Helmholtz resonance. Elliptical note areas are formed on the upper shell and tuned so that the (1,1)a and (1,1)b modes of each note area have frequencies that are in the ratios of 3:2:1 with respect to the fundamental, except in the highest notes where they are in the ratio of 2.5:2:1 or… 
HISTORY, DEVELOPMENT AND TUNING OF THE HANG
The HANG is a new musical instrument, suitable for playing with the hands, consisting of two hemispherical shells of nitrided steel. It is the product of a collaboration among scientists, engineers
Sound of the HANG
TLDR
The HANG was excited by taking multiple samples of each of a number of striking techniques with the hand, including single strokes from the soft part of the finger, as well as, the finger nail itself .
ACOUSTICS OF THE HANG: A hand-played steel instrument
The HANG is a new hand-played steel instrument developed by PANArt in Switzerland. We describe the modes of vibration, observed by holographic interferometry and the sound radiation from the
MODES OF VIBRATION AND SOUND RADIATION FROM THE HANG
The HANG is a new hand-played steel instrument developed by PANArt in Switzerland. We describe the modes of vibration, observed by holographic interferometry and the sound radiation from the
Acoustics of percussion instruments : An update
Methods for studying the modes of vibration and sound radiation from percussion instruments are reviewed. Recent studies on the acoustics of marimbas, cymbals, gongs, tamtams, lithophones, steelpans,
Percussion Musical Instruments
Percussion instruments are an important part of every musical culture. Although they are probably our oldest musical instruments (with the exception of the human voice), there has been less research