... repetition. The second improvement was the full cast-iron frame, invented by Alphaeus Babcock in Boston in 1825. That invention was the basis for today's extended keyboard. Last but not least, the grand piano was developed. The grand piano of today incorporates the best qualities of early ... John Broadwood & Sons, Jonas Chickering, Julius Bluthner, Ignaz Bosendorfer, Friedrich Bechstein, Henry Steinway, and Sebastien Erard, whose company fully developed the basis for the modern grand action by 1821" (Crombie).The piano is an instrument found in all parts of the world. "It's large range,...

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• Grade Level: High School