Why was the glockenspiel changed from a bell chime into a portable metallophone?

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The glockenspiel, whose name is derived from the German for "bell chime," was originally a set of graduated bells. Its transformation into a metallophone—a series of tuned steel bars—was primarily driven by the need for a portable instrument.12

This portability was essential for marching bands, which adopted a version of the instrument featuring bars arranged in a lyre-shaped frame, often referred to as a bell lyre. For use in symphony and opera orchestras, the instrument evolved into a large, horizontal form similar to a xylophone.12