Ian Bostridge tenor Julius Drake piano Franz Schubert (1797-1828) Der Wanderer an den Mond D870 This concert was live-streamed as part of the Wigmore Hall Spring Series 2021. The full video is no longer online.
There's no audience, btw; he's literally singing this to empty seats. As for his lowering his head, whatever helps him project the sound (to empty seats, in this particular case), I guess.