Celebrating “round” numbers, like 300, is all about numerology. Hence, I used numbers as a basis for most aspects of the composition:
I took the factors of 300 in the order 5, 5, 2, 3, 2, as semitone steps. This leads to a 7sus4 chord with the 5th in the bass. I took the root to be D, since D4 is closest to 300Hz. So my chord is D7sus4/A.
I knew one instrument had to be my Serge modular, which would play one evolving chord for the duration. I played the du-Touch w/a marimba sample, playing the chord 100 times. Lastly, a digital piano, playing the chord 10 times. 1-100-10.
One other thought: D7sus4 wants to resolve, but this occasion is not an end, just a mile marker for the Junto,. So it is fitting to have no resolution…