Özet:

The aim of this study is to determine the effects of vocal pieces of Turkish music tuned to 432 Hertz and 440 Hertz (Hz) on hearing performance. A4 (middle A) at 440 Hz, which was agreed upon as the standard by the ISO in 1955, has been used in this frequency since then. When the historical process in Europe until the agreement on this frequency is examined, it is understood that different frequencies (voice-instruments) had been experienced. In Turkey, however, it was determined that instrument recordings made in different frequencies can be found on YouTube, yet there is no scientific research on the effect of songs performed at different frequencies on hearing and performance. In the study, three vocal pieces in song forms, chosen from Turkish Classical Music repertory, were performed by vocal artists who were accompanied with the instruments tuned to 432 Hz and 440 Hz frequency, and these were recorded in a studio. The opinions of participants were taken after playing the voice recordings listened by academicians (21 people), who specialized in different branches of music, and (2019-2020 academic year) students of music departments (80 people). In addition, the experience of the vocal artists on the subject who took part in the experimental process is also presented in the study. The study was conducted by mixed method. The data about the experimental process of the study was obtained by using one group post-test model. The results, obtained via survey and literature reviews and from qualitative and quantitative data, were analysed through non-parametric statistical method, and the data was interpreted benefiting from descriptive statistical analysis method. 

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