The numbers in the title of this piece of music refer to pitches on a 12 note chromatic scale. A 12 sided die was rolled to generate 4 random pitches to use for improvisation. Therefore, a Bb instrument like the Trumpet on this recording uses the pitches G-A-Bb-D.
from Horns of Chaos,
released December 15, 2012
Brandon Rizzo - Trumpet, Keyboard, Production