Drum's pitch? (6)
I believe the answer is:
patter
I believe this is a double definition.
'drum's' is the first definition.
(thesaurus)
'pitch?' is the second definition.
(thesaurus)
(Other definitions for patter that I've seen before include "Salesman's persuasive talk" , "A series of light taps, raindrops or little feet" , "Run with light steps" , "Noise of fast light steps" , "Line of gab" .)