World’s Smallest Metronome May 15, 2002 by Dan This is just way cool. My friend Mike Elgan found the world’s smallest metronome — the Korg MetroGnome. It’s a bud headphone that hangs in your ear. Weighs two-tenths of an ounce. Won’t bug the neighbors or other musicians. I have no idea how well it works, but the gadget value is off the scale.