or bull-roarers.)

The system agrees with Mahillon and Hornbostel-Sachs for chordophones, but groups percussion instruments differently.

The MSA (Multi-Dimensional Scalogram Analysis) of René Lysloff and Jim Matson, using 37 variables, including characteristics of the sounding body, resonator, substructure, sympathetic vibrator, performance context, social context, and instrument tuning and construction, corroborated Schaeffner, producing two

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