Articles on source of music, church music? (6)
I believe the answer is:
anthem
'church music?' is the definition.
(anthem is a kind of church music)
'articles on source of music' is the wordplay.
'articles' becomes 'anthe' (two examples of the part-of-speech: an+the).
'on' means one lot of letters go next to another.
'source of' says to take the initial letters.
The first letter of 'music' is 'm'.
'anthe'+'m'='ANTHEM'
(Other definitions for anthem that I've seen before include "Uplifting song -- the man (anag)" , "The man for a patriotic song" , "Hymn of loyalty" , "The man for a popular song" , "National or religious song" .)