Delve into musical arrangements to understand finding the right key, song structure, chord roles/chemistry, instrumentation, voice-leading, and communication of musical ideas. This collaborative, music-making, chart-finding, transposing, timbre-talking, app using, music theory curious class is for all instruments who want to sing or play across genres and with other musicians and ensembles. Music = Melody + Harmony + Rhythm + Tempo. Learn on-line to identify these ingredients and their notations from handouts, listening, and ear training. Materials presented and annotated with forScore iOS app and/or screen-sharing. Class will work on individual and/or group projects to arrange songs for multiple instruments and enhance playable tunes together!