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: From the way a genuine Shaker musical rendition is performed in the passage, would you expect to see an orchestra pit or even a raised platform being used, so as to allow the singers to stand in an unobstructed line?
sentence1: The surviving Shakers sing songs drawn from both the earlier repertoire and the four part songbooks. They themselves perform all of these in single-line unison singing, with a small instrumental orchestra, although some outside groups prefer to perform unaccompanied tribute versions of the songs. The many recent arrangements of older Shaker songs for choirs or for solely instrumental groups mark a departure from traditional Shaker practice.