An observation from Performer's Revel:
Scadians love narrative.
We do get the occasional lyric or other form. But we adore story-songs. There are, for instance, far more songs written that tell the story of two people in love than there are professions or complaints of love. Songs that tell the story of one man who goes to war are more numerous than songs about the idea of war. There are far more songs about magic than there are incantations.
So, if you want to write a popular song, I would advise you to write a narrative song. We've got period models for that, so you can have your popularity and authenticity, too. In fact, I am beginning to suspect that the easiest way to slip period performance vegetables into people's bardics is to do narratives. Just not 10000+ line ones. That's pushing it.