Song in David Grier 2019 interview

Hi All,

there is a very small segment in the David Grier 2019 interview that I find really beautiful and I was wondering if it is a song. He plays 3 chords from 15:33 until 15:37 when talking about tone control. I have figured this part out but would love to know if it part of a full song. Does anyone know? David Grier 2019 – Cracking the Code