Seminar on extended just intonation and various nonstandard temperaments. We will review the necessary mathematics involved in interval calculations and cent-ratio conversion. Two notational systems will be introduced: Ben Johnston and HEJI (Extended Helmholtz-Ellis Just Intonation). We will learn how to set up microtonal notation/playback system in Dorico and compose music inspired by our expanded awareness of pitch resources. We will investigate limits of precision that can be expected in performance. In addition to composition and ear-training, we will also conduct in-depth analyses.