This photo was taken at the 1909 World's Fair in Seattle, the Alaska Yukon Pacific Exposition. It shows a band that is apparently ready to start playing.
Note the spelling of "Entrance." Otto also printed a version with the correct spelling:
There is another Image 252 (252 - S.S. Admiral Farragut). Perhaps Otto reused the image number because no one would be interested in an A.Y.P.E. card after the exposition ended.