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The problem of automatic key signature detection has been the focus of much research in recent years. Previous methods of key estimation have focused on chromagrams and key profiling techniques. This paper presents a remarkably simple but effective method of estimating key signature from musical recordings. The algorithm introduces the "keyogram", a concept resembling the chromagram, and is aimed for use on traditional Irish music. The keyogram is a measure of the likelihood of each possible major key signature based on a masked scoring system.
Cranitch, M., Fitzgerald, D. & Hart, M. Key signature estimation. Paper given at the Irish Signals and Systems Conference, Derry, Ireland, 2007. http://www.audioresearchgroup.com/