This is Alice Coote singing Lieder eines fahrenden Gesellen by Mahler at the Royal Albert Hall.
I - "Wenn mein Schatz Hochzeit macht" ("When My Sweetheart is Married")
II - "Ging heut Morgen übers Feld" ("I Went This Morning over the Field")
III - "Ich hab'ein glühend Messer" ("I Have a Gleaming Knife")
IV - "Die zwei blauen Augen von meinem Schatz" ("The Two Blue Eyes of my Beloved")
I think if I were to sing these, I would want it to be exactly like this.