sound

Purrrfect Frequencies Purring Having grown up with a big, black, fluffy tom cat, I can remember vividly his loud and proud purr and how soothing it was. It was usually a sign that he [...]

Frequency of Music Centuries ago musicians, composers and musical instruments had no standard frequency and were tuned to different Hertz. Seconds started being used as a units of time in the 16th century but [...]