faburden

noun3

1. •
   A kind of counterpoint with a drone bass.
2. •
   A succession of chords of the sixth.
3. •
   (no longer used) A refrain.

   • They haue all of them one and the same manner of tune in their singing; and commonly they make three rests in their song, besides the fa-burden in the end, which is a kind of grone. — 1601