Singing Musically part 2

What does it mean to sing musically?  Intonation should be precise; vowel qualities should be unblemished; phrases should always be released on a strong rhythmic impetus; the periodicity of the vibrato should be regular with its oscillating patterns rising and falling with increases and decreases of intensity; the melody must flow and possess a discernable shape and design; breath should be inspired within the rhythmic structure of the phrase being sung; while the total effect should appear to the listener as being a spontaneous utterance.