Simple Machines http://teacher.scholastic.com/dirtrep/simple/index.htmhttp://www.usoe.k12.ut.us/curr/science/sciber00/8th/machines/sciber/intro.htmhttp://sln.fi.edu/qa97/spotlight3/spotlight3.htmlhttp://www.mikids.com/Smachines.htmhttp://www.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htmhttp://www.kedt.org/asasite/MACHINES.htmhttp://www.enchantedlearning.com/physics/machines/Levers.shtmlhttp://www.edheads.org/activities/simple-machines/sm-glossary.htmhttp://www.mos.org/sln/Leonardo/InventorsToolbox.htmlhttp://www.smartown.com/sp2000/machines2000/main.htm (has music)