"Every singer knows how important is the management of the breath. I
always hold the chest up, taking as long breaths as I can conveniently
do. The power to hold the breath, and sing more and more tones with one
breath, grows with careful, intelligent practice. There are no rules
about the number of phrases you can sing with a single breath. A teacher
will tell you; if you can sing two phrases with one breath, do so; if
not, take breath between. It all rests with the singer.