I used to think that songs should make sense and be both logical and grammatical but came to appreciate that poetry (of which song is merely a musical version) can work better when it is not constrained by rules.

A number of my favourite songs jump from first person to third person and back again for no apparent reason and are none the worse for it.

I do not think it would be well received if after a fine rendition of "Carrickfergus" some pedant were to say "Surely it should be 'I wish I WERE...'?"

wr