Showing the effect of adding mass to a vibrating system. Example using a tuning fork and discussed as applicable to drum shell vibration. Frequency analysis with IDrumTune Pro drum tuning app.
Learn drum tuning with the free 12-part ‘Drum Sound and Drum Tuning’ course by drums and musical acoustics expert Professor Rob Toulson, available online at:
http://www.idrumtune.com/learn