This document describes one phase of efforts to reorganize music curricula in the K-12 General Music program in Duval County, Florida. Following the Systems Approach for Education (SAFE) curriculum development model, a curriculum for the junior-high General Music course was designed, based on performance objectives. A teacher test booklet was developed which includes items written for each objective, criteria for achievement, and a selection of musical examples required for aural and/or visual stimuli. Student pre- and posttest booklets were compiled from the teacher test booklets, 3M Datronics test scoring forms were selected, and audiotapes were made for each of the tests. All materials were analyzed for content validity, mastery, and hierarchy. Results of field testing show that (1) participating students improved their musical skills and knowledge, (2) participating teachers favored installing the curriculum, and (3) administrators approved extending the curriculum to all junior-high General Music classes. Extensive appendices include a course description, performance objectives, all the developed materials, requirements and constraints of the project, and an assessment system for music curricula. (Author/AV)