M3: Collected works
ML90: Writings of composers
ML410: Composer biographies
M430 - ML455: Theory & comp (history)
ML457: Performance practice
ML3811: Tonality/atonality/polytonality
ML3812: Modes, scales
ML3830: Psychology of music
ML3845: Aesthetics
MT5.5 - MT7: Instruction &study (theory)
MT 40 - MT67: Instruction &study (comp)
MT50: Harmony textbooks
MT70 - MT73: Orchestration & instr.
MT90 - MT146: Analytical guides
MT224: Keyboard harmony
MT870: Sight-singing (solfege)