A multiple part pick for engaging strings of a stringed musical instrument has a first part with a first blade for engaging the strings, a second part having a second blade for engaging the strings, and means for slidable connection between the first part and the second part for relative movement between the two parts. The blades of the two parts are mounted for a relative sliding movement accomplished by relative movement of the musician's fingertips, so that a musician can selectively choose which blade to use to engage with the strings without interrupting a musical performance. Different playing qualities among the blades allow the musician to produce different sound qualities without interrupting performance. In additional embodiments, added optional features include a third blade, a holder part, or a peg and channel feature, to keep parts from disengaging with one another during performance, or a gripping portion to prevent slippage.