Song’s distinctive quality (3)
I believe the answer is:
air
I believe this is a double definition.
'song's' is the first definition.
(air can mean a piece of music)
'distinctive quality' is the second definition.
(I've seen this before)
(Other definitions for air that I've seen before include "Broadcast - song" , "in which birds fly around" , "Dry; tune" , "Atmosphere, manner" , "Broadcast; atmosphere" .)