Radio version of no. 1 tunes from abroad (6)
I believe the answer is:
lieder
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for lieder that I've seen before include "songs from Berlin?" , "Art songs for voice and piano" , "[COMPOSITION] s" , "German Romantic songs for solo voice" , "Relied on German song (6)." .)