Very very tiny. I clamped it in steel pliers so I could use a magnetic pickup to record the sound it made. Slowed down by a factor of eight (down three octaves), it sounds like this.

I found this arboreal flail in a mud puddle in the park, so I glued it to a motor. It keeps the beat pretty well, until it falls apart.

It sounds like this. (Video here.)

It’s a familiar tune played upside-down and backwards, and then just backwards, and then upside-down and backwards again. Over and over, forever.

It sounds like this. (Video here)

A drum, some antique wind-up motors (from the Aladdin Toy Motors company of Brooklyn!), and leftover wood from the laser whistles combine to give you a simulation of the sound of a peaceful sunday morning in New York City. It sounds like this. (Video here)

Tower of pot & pan lids wired to an old floor lamp. Yes, I buy my cookware according to its sound; don’t you?

It sounds like this.

Good old-fashioned circuit-bending with a baby-rattling device I found in the trash and slightly modified. Magnetic pickup and contact microphone pick up sound in two different ways.

It sounds like this.

Fruit crate, found twigs, hardware, piezoelectric disc, sewing needle, hot glue, and "Walk This Way" by RUN-D.M.C.

I don’t have a record player, so it was time to make one out of whatever I had lying around. It sounds like this.

A strong magnet distorts the sound of a music box by warping the tines. It’s recorded through a hand-wound magnetic pickup, and it sounds like this. (There’s no processing added to the sound except for noise reduction.)

Thanks to k for the music box!