To make this flute you will need approximately 62m/20g main colour 8 ply yarn, a small amount of black 8 ply yarn, a quartet of 3mm double-pointed needles, a wool needle for sewing, assorted beads and buttons for keys (and possibly some wire/paperclips for rods) and a pipe-shaped support structure to insert into the flute to keep it in shape.
This pattern includes options for making a flute with a B foot joint or a C foot joint.