Time signature: An indication of rhythm following a clef, generally expressed as a fraction with the denominator defining the beat as a division of a whole note and the numerator giving the number of beats in each bar.
A time signature is a type of way to describe how the beat acts. For instance, if you've ever heard the pop song "Shake it Off" - Taylor Swift, you can count 1, 2, 3, 4. This means the are four beats (pulses) in each measure and each note is worth one beat
Sketchpad was the world's first CAD software but the first commercial CAM software system, a numerical control programming tool named PRONTO, had already been developed in 1957 by Dr. Patrick J. Hanratty.
