The way in which we prepare our bodies and breathe to sing greatly influences the quality of the sound that is produced afterward. It starts prior to the intake of the breath and the shaping of the vocal track.
One time I was asked if vowels were important in singing. I replied “vowels are like green vegetables in our diets: they are essential!”. This may seem obvious, but it’s important to understand the role vowels have in singing and how they are produced.