Tunes whose arrangement can bring hearty praise (4)
I believe the answer is:
airs
'tunes' is the definition.
(air can mean a piece of music)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for airs that I've seen before include "Attitudes or tunes" , "affectation of superiority" , "Tunes and affectations" , "affected demeanour" , "Melodies or artificial manners" .)