Two articles on Mike’s song (6)
I believe the answer is:
anthem
'song' is the definition.
(anthem is a kind of song)
'two articles on mike's' is the wordplay.
'two articles' means two replacements for 'article'.
'article' becomes 'an' (indefinite article).
'article' becomes 'the' (the definite article in English).
'on' means one lot of letters go next to another.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'an'+'the'+'m'='ANTHEM'
(Other definitions for anthem that I've seen before include "Uplifting song -- the man (anag)" , "One for doomed youth" , "Solemn song" , "The man for a patriotic song" , "Church choral piece" .)