proslambanomenos

"In music, the burden is the drone or base in some musical instruments, and the pipe or part that plays it, such as a bagpipe or pedal point in an organ. Hence, the burden of song is that part repeated at the end of each stanza; i.e. the chorus or refrain. The term comes from the French bourdon, a staff or a pipe made in the form of a staff, imitating the gross murmurs of bees or drones."