Trapezoid is an American folk music group led by Paul Reisler. Founded in 1975 by Sam Rizzetta and Reisler, they began as a quartet of hammer dulcimer players. Two of the four played the traditional hammer dulcimer, while the other two played baritone and treble hammer dulcimers specially designed by Rizzetta. The name of the band reflects the shape of the hammer dulcimer. Since 1975, the group's membership and instrumentation has changed repeatedly, always with Paul Reisler... meer