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How do we make musical sounds? To make a sound, we need something that vibrates. If we want to make musical notes, you usually need the vibration to have a nearly constant frequency: that means stable pitch. We also want a frequency that can be easily controlled by the player. In electronic instruments this is done with electric circuits or with clocks and memories. In non-electronic instruments, the stable, controlled vibration is usually produced by a standing wave. Here we discuss the way strings work. This is also a useful introduction for studying wind instruments, because vibrating strings are easier to visualise than the vibration of the air in wind instruments. Geometrically, both are less complicated than the vibrations of the bars and skins of the percussion family. For the basic physics of standing waves, see our multimedia tutorial. First you will notice that the speed of the wave in the string increases if you stretch it more tightly. This is useful for tuning instruments — but we're getting ahead of ourselves. It also depends on the "weight" of the string — it travels more slowly in a thick, heavy string than in a light string of the same length under the same tension. Strictly, it is the ratio of tension to mass per unit length that determines speed, as we'll see below.

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Police were responding to a report that a rifle had been pointed out of the window of Shaver's hotel room. After the shooting, the rifle previously assumed to be a lethal weapon , which remained in the room, was determined to be a pellet gun. Following an investigation, Brailsford was charged with second-degree murder and a lesser manslaughter charge and later found not guilty by a jury. He lived in Granbury, Texas , with his wife and two daughters. Shaver was employed as a pest control specialist, and was visiting Mesa for a business trip when he was killed. He was 26 years old.

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