It's been mentioned before (see eg Fitting words to music). It wouldn't be too hard to do; there are algorithm for getting syllables from English words fairly accurately. I implemented one to do preliminary matching of lyrics to tunes - preliminary because sometimes a syllable stretches over several notes in a tune so you need to check afterwards. (The method used a Turing machine with 17 rules to process the word. The rules were things like: if the current character is a consonant and current state is q0 then move 1 character to the right and set the state to q1).

Mick