noun
original key (of a song)
Abbreviation of 原曲キー. Used in music contexts, especially karaoke, to refer to the key in which a song was originally recorded.
See also: 原曲キー
この曲は原キーが高すぎて歌えない。
The original key of this song is too high for me to sing.
カラオケで原キーに設定する。
I set it to the original key at karaoke.