Hey, John, I agree with you on syllabication when you are trying to show emphasis and spacing in a song when it is impractical to give the sheet music. Unlike Jim, I see a reason for it.

To satisfy search engines, I doubt if anyone goes much beyond titles and first lines, which can be shown unsyllabified to satisfy these inhuman critters.

Rules? Yes, they may be found in style guides, but the simplest guides are those shown in a good dictionary such as Webster's Collegiate or Oxford Shorter Dictionary, etc. They cannot, however, be applied when dealing with texts 'as they was writ.'

To give a simple example, 'Long Island' is pronounced by some New Yorkers as 'Lon- Giland.' As Malcolm said, words sometimes must be represented as 'voiced' by the singer.