Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
1 Petite Grand-This is the smallest of the horizontal pianos. 2  It ranges in size from 4 feet 5 inches to 4 feet 10 inches. 3  It is indeed small but still powerful. 4  Baby Grand-A very popular type of piano which ranges in size from 4 feet 11 inches to 5 feet 6 inches. Upright-This is the tallest among the vertical pianos, with a height ranging from 50 to 60 inches and an approximate width of 58 inches. 2  This is the type of piano your great grandparents or grandparents used to play. 3  When cared for properly, it stands the test of time and maintains its rich tone.