History: Which of the following topics does electronic music not cover?

Which of the following topics does electronic music not cover?

• Sound reproduction.
  Changing sound formats is a significant topic to electronic music.
• Protocols.
  Protocols such as MIDI and OSC are a large topic in electronic music.
• Sound synthesis.
  Synthesis is one of the most basic electronic music techniques.
• Western music theory.
  While important to many types of music, including electronic music, there's no requirement for using western music theory in electronic music.