German songs for piano and voice (6)
I believe the answer is:
lieder
'german songs for piano and voice' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lieder that I've seen before include "German art songs" , "Relied on classical German song" , "German Romantic songs for solo voice" , "Relied on German song genre" , "Vocal works" .)