Abstract: A system that enables digital distribution of copyrighted sheet music—and allows musician to view the copyrighted sheet music on personal computing devices—while preventing the unauthorized distribution of copyrighted sheet music. An electronic commerce platform provides functionality to purchase copies of copyrighted sheet music. A network security module provides login credentials for purchasers and musicians (and, in some embodiments, limits the number of simultaneous logins). A graphical user interface provides functionality for each purchaser to distribute each purchased copy to one—and only one—musician. In some embodiments, the system allows purchasers to recall sheet music distributed to a first musician and distribute the recalled sheet music to a second musician (without providing functionality for the first musician to view the recalled sheet music).

Abstract: A method is provided for field balancing an assembly including a power turbine. The method includes coupling the power turbine to a load, identifying a first balancing plane that is aft of the power turbine, and identifying a second balancing plane that is forward of the power turbine. A balancing correction is determined at each of the first and second balancing planes. A balance weight is mounted at the first balancing plane based on the balancing correction determined for the first balancing plane, and a balance weight is mounted at the second balancing plane based on the balancing correction determined for the second balancing plane, wherein each balance weight is coupled to a respective bolt head without removing the bolt.