Property:Is in the key of

This is a property of type Has type::String.
 * Allows value::D Major/B minor
 * Allows value::G Major/ E minor
 * Allows value::A Major/F
 * Allows value::C Major/A minor
 * Allows value::F Major/D minor
 * Allows value::Bb Major/G minor
 * Allows value::Eb Major/C minor
 * Allows value::Ab Major/F minor
 * Allows value::E Major/C
 * Allows value::B Major/G
 * Allows value::C
 * Allows value::F
 * Allows value::Db Major/Bb minor
 * Allows value::Gb Major/Eb minor
 * Allows value::Cb Major/Ab minor