Good YouTube Videos on Resonance Sound Waves 

Lesson 35 - Sounding Pipes - Demonstrations in Physics
https://www.youtube.com/watch?v=4PyeNPZUKd8


Lesson 36 - Vibrating Rods and Plates - Demonstrations in Physics
https://www.youtube.com/watch?v=fj0xjS3BECc&pbjreload=101


Pipe Resonance
https://www.youtube.com/watch?v=_cpC4dtvVjI&feature=youtu.be


F-J's Physics - Barton's Pendulums and Resonance
https://www.youtube.com/watch?v=W4YaemEauGo



Speed of Sound Lab
https://www.youtube.com/watch?v=CM5IFM0N1bE&feature=youtu.be