This waltz comes from a jig generated by folk-rnn (v2) at some point. I can’t find its exact origin, but in the fall of 2021 MUSAiC master’s student Marco Amerotti synthesized a performance of it using MUSAiC PhD student’s Nicolas Jonason’s control-synthesis system (built on DDSP). Here’s Marco’s rendition:
I have only known it as tune no. 33633 on my Desktop, waiting for something to be done with it. It doesn’t sound like a jig _at all_, but something like a fast waltz even though the foot stomping is 2 against 3. Anyhow, I took the first part pretty much as is but totally rewrote the second part. Then added a third. And finally added the title.
Playing together with the MUSAiC team led to other tweaks, and nice harmonic progressions. In the video below I play on my “new” accordion — a third version of The Black Box, but this time made entirely bespoke by professionals (Castignari) according to my specifications (which they found so strange that they required 90% of the cost to be paid upfront: “If you do not end up buying it, no one will ever buy it, Sir.”) Anyhow, here we have Elin Kanhov (melodica), Anna-Kaisa Kaila (viola), Laura Cros Vila (flute), Luca Casini (soprano sax) and David Dalmazzo (guitar).
X:98
T:The Neverwhere Waltz
C:folk-rnn (v2) + Sturm
M:3/4
K:C
|:AB c2 A2 | GE C3D | EG c4 | Bc dc de | dc c2 A2 | GE C3D | EC DE EG |1 A4 G2:|2 A4 B2 ||
|:eg e2 d2 | eg e2 d2 | ^cg c2 B2 | ^cg c2 B2 | AB cA Bc | de dc BA | AB cA BA | G2- G^F G2 :|
[K:G]|:GA B2 G2 | cd e2 c2 | de fd ef | ef ge fg/a/ | bc' d'2 c'b | a4 g2 |1 f2 a2 ^c2 | d6 :|2 f2 a2 ^d2 | e6 |] 
Tunes from the Ai Frontiers 