Sunday, December 13, 2009

C Major Scale

Sorry, I don't remember how to rotate videos :( I guess the sound is the most important part though. Anyway, this is what a C major scale on a cello sounds like, though preferably more exactly in tune. I've been wanting to write a blog about the cello for a while now, and since we are currently learning about sound, it seemed like the right time. With most string instruments, a bow is pulled across the strings, which vibrates them and produces sound waves. The strings with a smaller diameter produce a higher sound and therefore waves with a greater frequency. The strings with a larger diameter produce a lower sound and therefore waves with a lower frequency. In orchestra everyday, we tune to an A with a frequency of 440 Hz. Some orchestras tune to an A with higher frequencies, but 440 is the most common. When string players tune, they either tighten the strings, which yields a higher pitch, or they loosen the strings, which creates a lower pitch. When string players place their fingers on the strings, it shortens the length of the string which produces higher notes of greater frequencies.

From the lab that we did on Friday, we learned that when you play a note and then move twelve half steps up, the frequency doubles. If you move twelve half steps down, the frequency halves. To apply that concept here, the second C that is played has a frequency two times that of the frequency of the lowest C, the third C played has a frequency four times that of the frequency of the lowest C, and the fourth and highest C played has a frequency eight times that of the frequency of the lowest C.

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