German art songs (6)
I believe the answer is:
lieder
'german art songs' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lieder that I've seen before include "Relied on German song genre" , "German art songs" , "Relied on German song (6)." , "Art songs for voice and piano" , "Musical settings for solo voice and piano" .)