"Pedagogy" is the art and science of teaching. A particular pedagogy is a specific approach toward or system of teaching something to someone. Likewise, a thing is "pedagogical" if it is intended to teach.
This chapter, "Pedagogy and Performance in Black Popular Culture," from Greg Dimitriadis's Performing Identity/Performing Culture marks the moment when many lyricists and MC's began to think of themselves as teachers.
"The message of By All Means Necessary, however, was considerably clearer, reflecting rap's increasingly explicit role as a tool for political communication and activism—as reflected on tracks like 'My Philosophy' and 'Stop the Violence,' among others" (Dimitriadis 55).
As I noted, these popular texts circulated in the space vacated by school-like curricula, which took on less and less relevance with the ascent of conservative regimes in the 1980s.