I went to listen a concert of the choir I was singing in before relocating in UK (Ars Antiqua: http://www.arsantiqua.org ).
I was really moved... It was the first time I listened them alive after 7 years...
The concert was too short for me, probably because I would have liked to go on for hours.
The program was music from XIII-XIV century from central part of Italy as part of celebration of 700 years of Jacopone da Todi birth.
"Dies Irae" sequentia was spectacular, but I missed gregorian chants, Ars Antiqua's strenght point.