Under the Lilacs by Louisa May Alcott

A picnic supper on the grass followed the games, and then, as twilight began to fall, the young people were marshalled to the coach-house, now transformed into a rustic theatre. One big door was open, and seats, arranged lengthwise, faced the red table-cloths which formed the curtain. A row of lamps made very good foot-lights, and an invisible band performed a Wagner-like overture on combs, tin trumpets, drums, and pipes, with an accompaniment of suppressed laughter.

Many of the children had never seen any thing like it, and sat staring about them in mute admiration and expectancy; but the older ones criticised freely, and indulged in wild speculations as to the meaning of various convulsions of nature going on behind the curtain.