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.
 



 
 
 
a as in bought
First Formant
Second Formant
Third Formant
This Recording
605
1445
2510
Denes and Pinson
730
1100
2440



 
 
i as in beat
First Formant
Second Formant
Third Formant
This Recording
335
1875
3140
Denes and Pinson
270
2290
3010



 
 
 
I as in bit
First Formant
Second Formant 
Third Formant
This Recording
481
1726
2461
Denes and Pinson
390
1990
2550



 
 
o as in blow
First Formant
Second Formant
Thrid Formant
This Recording
439
956
2397
Denes and Pinson
450
850
2410



 
 
oo as in glue
First Formant
Second Formant
Third Formant
This Recording
314
841
2028
Denes and Pinson
300
850
2240

 



 
 
u as in book 
First Formant
Second Formant
Third Formant
This Recording
487
1284
2288
Denes and Pinson
390
1050
2240


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)