The first three formants of 11 English vowel sounds
according to Denes and Pinson in The Speech Chain: The Physics and Biology
of Spoken Language.
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Piano
Piano a (formants at 605, 1445, 2510)
Piano i (formants at 335, 1875, 3140)
Guitar
Guitar a (formants at 605, 1445, 2510)
Guitar i (formants at 335, 1875, 3140)