I have sung the German Requiem, keb, so I know the challenge. Take a nap, or at least an extended feet-up rest, in the afternoon before the performance. Also, drink lots of water — at least two litres — between getting up in the morning and late afternoon.

My concert blacks consist of an ankle-length A-line skirt and a vee-necked shirt with three-quarter sleeves; black sneakers and black Thor-lo socks; and black footless tights or LL Bean silk longjohns, depending on the season. I’m never in the front row, so the audience doesn’t get to know about the sneakers, which have orthotic insoles.