Conversation so far:
What were some musical instruments used in music sampling?
A sampler is an electronic or digital musical instrument which uses sound recordings of real instrument sounds, excerpts from recorded songs or found sounds.
What other things did music engineers use to sample music besides a sampler?
The Guardian described the Chamberlin as the first sampler, developed by the English engineer Harry Chamberlin in the 1940s.

Question: Who used this
Self-contained rewrite: Who used EMS Musys?