Kuhn, G. and Dienes, Z. (2005). Implicit learning of non-local rules in music. Implicitly learning more than chunks. Journal of Experimental Psycholog: Learning, Memory and Cognition, 31, 1417–1432

The material is represented in three different formats, diatonic intervals, pitches and chromatic intervals.  In the pitch representation C3 – C4 indicate middle C to the C above.