Most orchestras are made up of predictable instruments: strings, brass, percussion, and woodwinds, among others. But in 1985, the United Kingdom birthed an orchestra with only one kind of instrument, and not a symphony regular at that: the ukulele. The Ukulele Orchestra of Great Britain has been making music ever since, performing humorous renditions of everything from Tchaikovsky to Nirvana to spaghetti western soundtracks. The group will perform on April 20 at 7:30 p.m. at the Green Music Center in Rohnert Park. Tickets are $25–$85 and may be purchased at gmc.sonoma.edu/ukuleleorchestra.