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Figure 7: Frequency spectrum of the three compositions used. Obtained by the software Audacity 1.3.12 (beta version) Moz-Mozart; Bee-Beethoven and Lig-Ligeti

Figure 7: Frequency spectrum of the three compositions used. Obtained by the software Audacity 1.3.12 (beta version) Moz-Mozart; Bee-Beethoven and Lig-Ligeti