This is the 8622nd most frequent Korean word.
가수로
"As a singer."
In this example, "가수로서" extends "로" to mean 'as a singer' in a comparative or qualifying sense.
그녀는 가수로서의 자질을 갖추고 있다.
She has the qualities of a singer.
In this sentence, "가수로" is used to express the role or capacity in which the individual achieved success, employing the instrumentality particle "로."
그는 가수로 성공을 거두었다.
He achieved success as a singer.
Here, "가수로" indicates the role or identity under which someone can participate in the competition, again using "로."