Simplify the following text for a Grade 12 native English-speaking person.
Original: The film features legendary thereminists Clara Rockmore and Lydia Kavina as well as electronic instrument pioneer Robert Moog , Nicolas Slonimsky , The Beach Boys founder Brian Wilson , and Theremin himself .
Simplified: The film features thereminist Clara Rockmore as well as electronic instrument pioneer Robert Moog , Nicolas Slonimsky , The Beach Boys founder Brian Wilson , and Theremin himself .