Piano commanding flourished during the jammed 18th generation in the Viennese school, which included Johann Andreas Stein (who worked in Augsburg, Germany) and the Viennese makers Nannette Streicher (daughter of Johann Andreas Stein) and Anton Walter
Square pianos were built in abundant numbers through the 1840s in Europe and the 1890s in America, and saw the most visible changes of any type of piano: the celebrated ferrous framed over strung squares manufactured by Steinway & Sons were added than two and a fractional times the size of Zumpe's weald framed instruments from a span before. Their overwhelming popularity was due to inexpensive construction and price, although their performance and tone were often fixed by simple actions and closely spaced strings.