classical music calming

What piece of classical music playing would you, to reassure you, if your friend broke out a friend with you?

It has not happened, not go away, but you should always be prepared.

It's a long, long time since I suffered the agonies of young love, but I remember me when I was about 20, and made with a friend of long standing I played Kathleen Ferrier sings "Che senza" (from Gluck's "Orpheus and Euridice) and Beethoven's Violin Concerto over and over again!

Pachelbel Canon in D major – Violin (eXquisite version)