Thanks to the use of flutes, beautifully harmonious (8)
I believe the answer is:
tasteful
'beautifully harmonious' is the definition.
'tasteful' can be an answer for 'harmonious' (thesaurus). I am not sure about the 'beautifully' bit.
'thanks to the use of flutes' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'to the use of' is an anagram indicator.
'flutes' is an anagram of 'steful'.
'ta'+'steful'='TASTEFUL'
Can you help me to learn more?
(Other definitions for tasteful that I've seen before include "Showing good aesthetic judgement" , "Decorous" , "pleasantly entertaining" , "with discrimination" , "Free of tawdriness" .)