What functionality best describes MIDI (Musical Instrument Digital Interface)?

The functionality that best describes MIDI (Musical Instrument Digital Interface) relates to its role in the creation and manipulation of music data rather than as a format for recording music itself. MIDI is a protocol that allows electronic musical instruments, computers, and other devices to communicate and share musical information. It transmits data such as notes, velocity, pitch, control changes, and timing, enabling musicians and producers to control virtual instruments, sequencers, and other music production tools.

While MIDI data can be recorded and played back, it does not represent audio waves; rather, it encodes information about how music is meant to sound. This difference is crucial: MIDI can be manipulated easily—notes can be changed, edited, or rearranged without affecting the quality of audio playback.

The other options do not accurately reflect the core functionality of MIDI. While MIDI can certainly be used during live performances and can interact with notation software, its primary function is to communicate detailed information about the music rather than to provide a specific performance standard, audio recording, or notation software.