Musical Instruments, http://www.exhibits.pacsci.org/music/instruments.html

Intensity and the Decibel Scale, http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l2b.html

The Physics of Everyday Stuff, by Sam Hokin, http://www.bsharp.org/physics/stuff/guitar.html

Physics Homepage, http://www.kent.wednet.edu/staff/trobinso/physicspages/PhysOf1998A/Acoustics/page2.html

Resonance, http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l5a.html

Open-End Air Columns, http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l5c.html 

Physics of Music, Summary Chapter EIGHT, Percussion Instruments by Dr. John Ask, http://faculty.millikin.edu/~jaskill.nsm.faculty.mu/musicsum8.html

Percussion, http://www.kent.wednet.edu/staff/trobinso/physicspages/po2000/jones/

Physics of Musical Instruments, http://physics.about.com/library/weekly/aa110400a.htm