Conversation so far:
How do celluloid records have anything to do with bill Laswell?
Bill Laswell became the de facto house producer for Celluloid until the label was sold in the 1980s
Where was Celluloid records  located?
in New York City
Was there anyone else involved in the label Celluloid records with bill Laswell?
Martin Bisi
Did any other artists record under the Celluloid records label, too?
musicians such as Whitney Houston, Sonny Sharrock, Archie Shepp, Henry Threadgill, and the band Massacre
Why style of music did Celluloid Records predominately record?
Bill Laswell recorded music that was experimental, combining jazz, funk, pop, and R&B

Question: What is meant by Material excursions?
Self-contained rewrite: What is meant by Material in Bill Laswell's article?