By the 1920s, with the advent of the public dance movement, people were gathering in large groups to listen to steelguitar music.
到了20世纪20年代，随着大众舞蹈运动的出现，人们聚在一起听钢棒吉他乐。
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Then came steel strings, and that led to the lap guitar—which is also called the steelguitar because the player slides a steel rod up and down the neck.