This video explains what is sound and how is it produced (i.e. by vibrations) by giving examples of a bell, various music instruments and our voice. It explains the difference between music and a noise by playing various instruments like Piano and Jaltarang. It then explains what is echo and how it is produced. It refers to a touching story - Life is an echo - that teaches children what you sow, so shall you reap. This story can be seen at
