original passage: The surviving Shakers sing songs drawn from both the earlier repertoire and the four part songbooks. They perform all of these unaccompanied, in single-line unison singing. The many recent, harmonized arrangements of older Shaker songs for choirs and instrumental groups mark a departure from traditional Shaker practice.
original sentence: They perform all of these unaccompanied, in single-line unison singing.
sentence2: Could someone who had read this passage, yet knew little else about the history of music, conclude that instruments such as the tambourine or the maracas trace their origins to Shaker performances?
sentence1: The surviving Shakers sing songs drawn from both the earlier repertoire and the four part songbooks. All of these songs are performed in unison by singers who are arranged in a single line, without musical accompaniment The many recent, harmonized arrangements of older Shaker songs for choirs and instrumental groups mark a departure from traditional Shaker practice.