I was trying to play Lucio Battisti's "Con il nastro rosa", so I set out to find the chords.
Contrary to what usually found googling, the song is in C#m, not Bm. Besides that I think the third chord is, or may be, a wonderfully harmonic B6/7.
So here is my tablature
All chords sound pierced by a G#. In fact, it is played at the beginning of each bar during the musical break.
Playing the songs in Em yields easy chords:
I suspect that our beloved artist first discovered this beautiful progression of chords pierced by a note, and then created a song around it.