The most common and most likely answer to this crossword clue is the 8 letter word TONALITY
I've seen this crossword clue in The Times
T
O
N
A
L
I
T
Y
More clues leading to the result TONALITY
Buddy explains!

The straight part
We know that "Pitch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pitch = tonality.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TONALITY mean?
TONALITY noun- The system of seven tones built on a tonic key; the 24 major and minor scales.
- A sound of specific pitch and quality; timbre.
- The quality of all the tones in a composition heard in relation to the tonic.
- The interrelation of the tones in a painting.