Earlier, we had a Gustav Mahler song from the composer’s early maturity – a song that Mahler reused substantially in his First Symphony. “Ging heut morgen übers Feld” is from “Songs of a Wayfarer”. Singing it was a baritone whose recordings run into the hundreds. For instance, this mystery singer made no fewer than eight recordings of Schubert’s “Winterreise”. Who is he?