The Carnegie Free Library of Allegheny, Andrew Carnegie’s first donation (and the second one to open, after Braddock), set the pattern for many of the larger libraries to come: it included not only a library but also a music hall, so that the building gave the people of the city a palace of culture. This is the first Carnegie Hall ever: the one in Braddock was a later addition to the library. The architects of this building were Smithmeyer & Pelz, who had earned their library-drawing credentials by winning the competition to design the Library of Congress. First Smithmeyer and then Pelz would later be thrown off the Library of Congress job, because it’s hard to work on a huge government project that’s eagerly watched by every newspaper in the nation and supervised by the entire United States Congress. They probably found it much easier to deal with Mr. Carnegie. Nevertheless, all Mr. Carnegie’s other libraries in Pittsburgh were designed by Longfellow, Alden & Harlow, or just Alden & Harlow, who became his preferred firm and knew exactly what he wanted.

The music hall is now in use as the Hazlett Theater.

The main library was damaged years ago by a lightning strike, which provoked the library to move out to a new building on Federal Street; but the Children‘s Museum has taken over and restored this historic building and uses it as the Museum Lab.