Well, I don't know who's singing it, but it's a very famous song, "The First Time Ever I Saw Your Face", written by Ewan MacColl for (and about) Peggy Seeger, who was the first to record it. The best-known version is the one by Roberta Flack, but it's become one of those songs that anyone who fancies themselves as a "song stylist" tends to have a go at, so there are literally hundreds of different versions. Ewan MacColl himself apparently hated almost every one of them and kept them in a separate section of his record collection which he called the "chamber of horrors". In any case, as he was usually a fiery protest singer, he tended to be a bit embarrassed that his most successful song was a soppy love ballad.