If I have the following chord progression in a song in key of Bm:
Bm G A Bm
and then in the bridge a C major chord jumps in the progression, as below:
... D G A (C) Bm....
(C introduces the bridge and is followed by the tonic again)
How could be this 2nd-flat chord interpreted in terms of harmony?
According to my knowledges it:
can't be some secondary dominant for this scale (in Bm the F is #)
can't be a modal interchange (C is # also in Bmajor scale)
is not a translation inside the minor scale (it belongs neither to harmonic nor to melodic minor scales)