Comaprative recordings were made in concert pitch 432 Hz and 440 Hz:
Tanya Spasova – viola
Bisera Dimitrova – violin
Miroslava Dimitrova – violin
Anna Karalasheva – violoncello
Sound recordings of speech in city environment.
432 Hz Concert Pitch and Intonation Research Project
Comaprative recordings were made in concert pitch 432 Hz and 440 Hz:
Tanya Spasova – viola
Bisera Dimitrova – violin
Miroslava Dimitrova – violin
Anna Karalasheva – violoncello
Sound recordings of speech in city environment.