Improvised verses in Welsh sung to the accompaniment of a harp, especially in contest at an eisteddfod.
as modifier penillion singing
 Example sentencesExamples
-  Penillion is soaked in the Welsh tradition of improvised vocal descants to the harper's melody.
 -  Pennillion singing is generally a subject in musical competitions.
 -  Penillion singing therefore allows both the vocalist and the musician to ply their skills within their own frameworks.