Musical instruments -- they create notes, perhaps (9)
I believe the answer is:
recorders
I believe this is a double definition.
'musical instruments' is the first definition.
(recorder is a kind of musical instrument)
'they create notes perhaps' is the second definition.
(people who record or note things)
(Other definitions for recorders that I've seen before include "Those who write down notes" , "Judges" , "musical instruments" , "Music producers" , "Tubular wind instruments" .)