Physical CDs cannot change key, loop four bars, or slow down a Charlie Parker tune from 280 bpm to 140 bpm. The streaming player’s digital signal processing (DSP) enables these functions, directly applying educational psychology principles (varied practice, part-whole training).
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Prouty, K. E. (2012). Knowing Jazz: Community, Pedagogy, and Canon in the Information Age . University Press of Mississippi. Physical CDs cannot change key, loop four bars,