Audible tunes for king or queen, say (6)
I believe the answer is:
leader
'king or queen say' is the definition.
(king and queen are types of leader)
'audible tunes' is the wordplay.
'audible' indicates a 'sounds like' (homophone) clue.
'tunes' becomes 'lieder' (German plural of 'lied', a type of song).
'lieder' is a homophone of 'LEADER'.
'for' is the link.
(Other definitions for leader that I've seen before include "Front-runner or head of group" , "Editor's article" , "source of inspiration" , "Director, guide" , "One is ahead and shows the way" .)