The old singing teachers of the 1800 era would stress exercises before allowing the singer to try a song, something modern students would rail against. This concentration on “rehearsal” was obviously beneficial because singers were not worried about particular notes in their range. They had learned how to hear them in their brain and ALLOW them to happen. The other night I watched Pavarotti sing the great aria, Nessun Dorma, from Turondot, on You Tube. It’s a singing lesson for all tenors or anyone. Pavarotti sings the aria with its high tessitura, strings of high A’s, and a final B natural, without the slightest squint, lifting of shoulders, or tense facial movement. He could have been singing Jingle Bells. Such superlative performances are a product of tireless productive rehearsal, i.e. practice.

Best Regards to you and yours and stay well.