Class is in session on Harmonize’s second album, which brings together artists and genres from across the continent. With each track as a serving as school subject, Harmonize (Rajab Abdul) covers love, forgiveness, inspiration and more across 20 tracks. Rooted in East African melodies, High School sees Harmonize widen his syllabus to include more English language lyrics—and a host of collaborators from Naira Marley (“Song”) and Sarkodie (“Why”), to Busiswa (“Sandakalawe”), Ibraah (“Mdomo”) and Sholo Mwamba (“Kamaliza”).