The drone pipe has a finger hole, which allows it to be stopped.
On the October 2, 1933 recording of "Doin' the Uptown Lowdown," Johnny Mercer makes what must have been one of his first appearances on record.
In 2002 Renovation Records issued It Isn't Fair, a collection containing some of Richard Himber's earliest known recordings.
Rarest of all, perhaps, is a medley of "Dancing on the Ceiling" and "Of Thee I Sing," dating from 1932.
They then go on a date and at the end of the date they enter a studio and sing the same song together - hopefully in tune.
It is too soon to tell whether any long term relationships will come out of this however.