Wow, just wow!
I assume you've listened to this song a thousand times casually, and probably sung along with it. But once you decided to record it, how many hours did you spend working with it to be able to sing it? Not considering actual recording or mixing time, just getting up to speed to sing it. Is it a matter of 15 minutes, or 2 hours, or 10 hours? And do you use sheet music, or is it purely a by-ear thing?
I'm a beginning singer, with all sorts of deficiencies, and lately have been working on songs with a local teacher, and I find it's easy to spend quite a lot of time on one phrase getting it right. In my case 'right' means more or less on pitch. I have this probably mistaken idea that 'real' singers can pick something up with at least most of the nuances right away, i.e. within a few sing alongs.
For my guitar playing, I'm used to spending a lot of time to get something down well, and wondering if the singing process is similar, or if it's 'easy' once someone is at your level.
Thanks,
Greg