This is a perennial choir issue.
Clear enunciation makes sure the audience can hear the words and follow the story the song is telling.
Vowels carry the sound.
Consonants carry the words.
Consonants at the beginning of line must happen together - by everyone! Otherwise the song sounds ragged and unrehearsed.
Final consonants must happen together. Cut lines off together, so you don’t get a machine-gun effect.
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