The present article focuses on the question of whether the timbre difference of two sounds with harmonic spectra, produced by natural musical instruments or the singing voice, may influence subjective assessments of the pitch of one sound in relation to the pitch of the other. The authors administered a series of perception tests to a group of professional musicians (n = 13) and a group of non-musicians (n = 13). The tests used the following pre-recorded sounds: the singing voice, the sound of the viola, and the sound of the trumpet. The participants had to compare the pitch of pairwise presented successive tones and decide whether the second tone was either 'flat', 'sharp' or 'in tune'. Tests using stimuli in the pitch range around A3 (220 Hz) at a loudness level of approximately 90 phons revealed pitch shifts of significant magnitude likely to affect intonation quality in a musical performance among both musicians and non-musicians. The conclusion drawn from the study is that timbre-induced pitch shifts may attain magnitudes that are likely to lead to conflicts between subjective and fundamental-frequency-based pitch assessments. Situations are described in which such conflicts may arise in actual musical practice.
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