Composer and guitarist Milton Mermikides, speaking at Gresham College's LSO St Luke's venue, argues that music and the human body are inseparable. He opens with Boethius's three definitions of music before turning to musica humana, using MRI scans of singers to show how the vocal tract produces overtone singing and beatboxing, and playing examples from Bobby McFerrin and Take Six to illustrate body percussion. He traces consonance and dissonance back to the physical structure of the cochlea, compares twelve-tone equal temperament against microtonal tuning systems, and shows how instruments like the guitar and flamenco technique mirror the shape of the hand, citing Guido of Arezzo's hand-based notation system. A section on disability and invention covers Django Reinhardt, Jeff Healey, and the one-armed pianist Paul Wittgenstein. The lecture closes with his own experience of leukemia, turning blood cell counts and DNA sequences into musical compositions, framing sonification as both science and autobiography.