Tin cans, automobile brake drums, saw blades, an old computer, highway signs, oil cans, wine bottles, radiator parts, window shutters, clay flower pots, scrap metal & wood are some of the 100+ pieces of junk Knaack uses to create Junk Music ™. His CD recording, Junk Music ™ contains two different types of music. One type is a musical exploration of particular "families" of materials (i.e., Wood Music, Metal Music, Shaker Music, Kitchen Music, Rock Music, Paper Music, Wind Chime Music, etc.). The second type combines these materials in compositions that focus on specific music styles (i.e., Samba, Waltz, Conga, March, etc.).