You have been captured and a gunman will set you free if you complete his oddly specific task.
Sing any song of your choosing correctly from start to finish.
No nursery rhymes, no hymns, no Happy Birthday or suchlike, and no songs where the lyrics are one line, or even one word (well done for thinking laterally, but if you annoy him with your choice he’ll shoot you anyway).
If you choose a song with a repeated chorus at the end, you have to get the number exactly right.
Fade-outs and ad libs, too.
No variation from the actual lyrics, such as an ‘and’ instead of ‘so’ are acceptable, and no hesitation.
So what’s your song?
Edit: Oh, and I probably should have mentioned, you don’t get musical accompaniment.