What was Tin Pan Alley and why was it important?

The term 'Tin Pan Alley' refers to the physical location of the New York City-centered music publishers and songwriters who dominated the popular music of the United States in the late 19th century and early 20th century. Tin Pan Alley was the popular music publishing center of the world between 1885 to the 1920's.

Explanation:

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its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

a.) are both appointed for life