The Aria is from Henry Purcell's early English Opera of 1689. Dido Queen of Carthage laments the departure of her Trojan lover Aeneas and resolves to die. She sings

When I am laid, am laid in earth, May my wrongs create
No trouble, no trouble in thy breast;
Remember me, remember me, but ah! forget my fate.
Remember me, but ah! forget my fate.

It is the saddest and most beautiful song, but opera isn't to everyone's taste. I am really enjoying this version sung by Alison Moyet.