The main tool of composers of electronic music during the 1950s was the

tape studio

Electronic music is music produced solely from electronic generators. It was first produced in Germany in 1953 but also was created in Japan and the United States in the 1950s.  

Composers of electronic music during the 1950s used the tape studio as their main tool.

Tape studio

The main tool of composers of electronic music during the 1950's is tape studio. It was first made in Germany in 1953. Later on, it was also found in Japan and the United States in the late 1950s. It was used by speeding it up and down, altering pitch, giving echoes, filtering and by changing the tone. It was difficult and time consuming to use.

c. the branch of philosophy that deals with beauty and how it is expressed and appreciated