The fun side of folk music was explored by the Jim Kweskin Jug Band. During the five years they were together, they successfully transformed the sounds of pre-World War II rural music into a springboard for their good-humored performances. A communal-like musical ensemble, the Kweskin Jug Band were formed by Jim Kweskin, who had been inspired by a folk group, the Hoppers, featuring washtub bass player John "Fritz" Richmond. As a student at Boston University, Kweskin would often attend the Hoppers' performances at Cafe Yana in Harvard Square, learning much about guitar fingerpicking by watching the bandmembers' fingers. After Richmond was drafted into the U.S. Army, serving time in Korea and Europe, Kweskin began to frequent other folk clubs in Cambridge and Boston. Before long, he was playing guitar well enough to perform English and Appalachian ballads in folk coffeehouses.