Hindsight · review build · data not yet validated
Human musicians routinely jam with cybernetic musicians.
Grader A: partial
Software and keyboards that play along with a human existed and were widely used by amateurs: Band-in-a-Box (since 1990) generates backing bands and solos, and arranger keyboards have auto-accompaniment. But 'routinely jam with cybernetic musicians' overstates it; responsive computer musicians that improvise with humans stayed a research topic.
Test: Use of auto-accompaniment software or keyboards among amateur musicians: measurable (more than 5%), below routine for working musicians; interactive improvising partners under 5%.
Grader B: miss
Human musicians did not routinely jam with responsive software musicians in 2009 or by 2014. Auto-accompaniment software such as Band-in-a-Box (since 1990) generates backing tracks from a chord chart. It found a niche with one-man bands and for practice. It follows a fixed chart and does not improvise in response to the player. Interactive improvising systems stayed in research labs.
Test: Test: 20% of musicians routinely play with interactive computer musicians. 2009-2014: niche use of accompaniment software only; no evidence of routine interactive jamming.