Yes, especially when learning something new. In rehearsals, all wise singers save their voices – not in the sense that you only have just so much to give, but to keep your voice relaxed during a potentially stressful situation. Rehearsals by nature are very demanding on a voice. It’s stop-and-go as you learn notes, check pitches, work on blend, and everything else. This makes it very easy to fall back into old habits. Therefore, you should do what is called “marking” your music – singing lightly or even dropping the high notes down an octave, until all the notes are learned and you know what’s expected of you. Once you know where you are going with your voice, your neuromuscular system will be much more cooperative in helping you sing the right notes with the proper technique.