Commissioned by Mrs. Gene Rochberg to celebrate George Rochberg's 70th birthday in 1987.

Fiery and funky, Spark is a 3-minute ride commissioned by conductor Kirk Smith for his daughter, the young viola virtuoso Yvonne Smith, whose stunning YouTube performance of the work has brought Spark's excitement and beauty to thousands of viewers. Says Dorff, "Spark is just a short spark of an idea, designed to peak and conclude within 2 minutes. It has a lot of gritty drive, a polymetric parody of the Bach Suite that I had heard Yvonne play, some flavorings from funk and from the 19th-century German masters, and in the long run is a series of build-ups into a romantic tune that finally blossoms as the coda." For advanced violists.

A Hummingbird Hides on the Ceiling. Kissing Gouramis Get Chapped lips. An Inchworm Converts to Metric. The Melancholy Collie (Lassie Sings the Blues). A Tortoise Drinks Decaf and Falls Asleep. Centipedes Dance a Sarabande. A Color-blind Peacock Suffers Through Mating Season. Two Moths Fight over an Old Flame. A Worm with Two Broken Hearts. An Injured Gerbil Goes to the Re-tail Store. Two Porcupines Try to Cuddle. Duration: c.17"