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: If a surviving Shaker had wanted to try out for American Idol, and was already okay with singing alone, would he or she also feel at home auditioning in the early rounds, when the singer must perform a capella style without any musical backup?
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.