foo_musical_key is a foobar2000 component that detects the musical key of selected tracks with libkeyfinder or by ear via a MIDI piano keyboard interface, writes the result to foobar2000’s metadata database, and can write the key tag back into the source audio file.

The component adds a Musical Key Analyser context-menu group and ships as a standard .fb2k-component package for foobar2000 users.

Features:

• Detect musical keys automatically for one or many selected tracks (libkeyfinder).
• Detect the key of a single track manually by playing notes on your keyboard (MIDI out, Windows default GS synth).
• Run automatic analysis in a background worker with foobar2000 progress UI.
• Write detected keys to foobar2000’s metadata DB without touching the file.
• Write the key tag from the DB into the audio file on disk (separate action).
• Choose one of three output notations:
  • Standard (C, Am, Dbm)
  • Camelot (8B, 8A)
  • Open Key (1d, 1m)
• Configurable tag name (default: Initial Key).
• Build x86 and x64 binaries and package them into one .fb2k-component.

github.com/PEERSOFTdev/foo_musical_key
hydrogenaudio.org/index.php/topic,129518.0.