If I'm playing a song in Dorian D would I say that the song is in the key of C? Or is the song in the key of D, cause that my true tonic?
I guess the question can be boiled down to, is the tonic the same as the key?
So if Dorian D is in the Key of D, would I say, this song is in the Key of D in Dorian? Or just, this song is in the Key of D(if I say this i suspect they will assume I'm saying major)?