In fact, for Ballblazer, Langston created an algorithmic composition system, which allowed the game to improvise music (from an initial set of musical snippets contributed by famous musicians) based on what is happening in the game. Langston later left Lucasfilm Games for Bellcore (now Telcordia Technologies).
The passage describes Langston's work on the game Ballblazer, which used an algorithmic composition system to create music. He then left Lucasfilm Games to join Bellcore (now Telcordia Technologies).