Here is more...

Vowels are melody mostly, and consonants are percusive!

Consonants have tiny vowels in them, if you are desperate and need a miracle...

Many of our pop singers break basic singing conventions, by needing to sound different... or because of a lack of training... or because the song just hasn't been sung often enough before recording it (endemic music biz problem...)

One workable solution I use, is to sing the song many times without "boxing it in"... let the words adjust to your need for lyrical rhythym, over time. This requires more time, but the finnished product is much more singable... Actually, I beleive that this is one of the big reasons folk/trad songs are so 'fit to be sung'. ttr