The sound you heard in the portal is from bar chimes or mark tree, a percussion instrument used primarily for musical colour, created in the last 1960's by percussionist Mark Stevens
Brahms, as a gift to his friend Bertha Faber, who gave birth to a son, took a German folk text and to its rhythm composed one of the most known melodies in the world
A piece from Vivaldi's "The Four Seasons". He was ordained a priest, but begged off his duties due to chest ailment. Some biographers believe he faked this to dedicate more to music.