Why does middle C played on an oboe sound different from middle C played on a piano?
I don’t think the questioner was asking about pitch. I think he/she was asking about timbre. The only person who has answered so far is assuming this is an intonation question.
But a middle C on an oboe sounds different than a middle C on flute and both sound different than a middle C on piano. Just as notes all sound different on different instruments and with different voices. My voice is low. When I sing anything above about an A-440 I sound like I’m really reaching. The high F on an oboe sounds … well … high! That same high F sounds like your average flute note. If a tuba could play that high, it would sound incredibly, unbelievably high. It’s about timbre, if you ask me.
tim·bre
[tam-ber, tim-; Fr. tan-bruh]
–noun
1.
Acoustics, Phonetics . the characteristic quality of a sound, independent of pitch and loudness, from which its source or manner of production can be inferred. Timbre depends on the relative strengths of the components of different frequencies, which are determined by resonance.
2.
Music . the characteristic quality of sound produced by a particular instrument or voice; tone color.
Or is it? Thoughts?
Any of you adventurous sorts want to go to answer the original question?