Assuming david is required, and l is required, and shrader is required, the following 2 results were found.
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Microcomputer-Based Teaching—Computer-Assisted Instruction in Music Comes of Age
"Automated Music Training: Final Report on Phase One," Journal of Research in Music Education XIX (1972), 474-480. 3David L. Shrader, An Aural Approach to Rhythmic Sightreading Based upon Principles of Programmed Learning, Utilizing a Stereo-Tape...
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A Brief History of Computer-Assisted Instruction in Music
Prevel, "Low-cost, Computer-assisted Ear Training," Journal of Computer-Based Instruction VI, No. 3 (1980), 77-78; David L. Shrader and David B. Williams, "The Development of a Microcomputer Based Music Instruction Lab," paper presented at the Music...