Thanks for the responses :)

The lyrics definitely fit. I suppose I could send someone an audio file of how they fit, if they could tune out my tunelessness (That's probably not a word...). There are certain words that hang over two or more notes. Examples including:
"A brand new start i-is waiting for you".
"You-ou-our legacy will remain".
Very hard to make that work via text, I understand, and I can't read a note of sheet music so trying to add the words underneath would be a fools errand.

I appreciate your giving it a listen Leeneia :) it is a big range, but maybe there's someone out there who could do it. Or someone with an ear for harmonies that could harmonise the too-high/too-low notes and make them work?

Tatties, again, I appreciate the listen. If you (or maybe someone else?) have the ability to transpose the music, that would be fine with me.
Mistaken/mistaking... Interesting question. The genuine answer is, I don't know. I would use "mistaken" as a colloquialism without second thought, but I suppose in proper English "mistaking" would be the preferred term? If someone were to take this on, I would be more than happy for them to use whichever felt more natural.

As per Helens advice: the lyrics belong to me, and would be credited to "Nevada", which will hopefully be my handle if accepted for membership.