Whoah, do not do this. All it'll do is make your throat slimy, unless it's the kind with menthol, in which case it'll really screw up your singing voice. I saw a guy get sent home from a college level jazz ensemble practice because he had Vicks Vaporub on his chest and it was messing with some of the other singers' voices.Brutal Peanut said:Line your throat with Vaseline, makes your voice come out smoother. An old Elton John trick.
OT: You picked a bad time to ask for help from the internet. If you had asked a month out and you had included a recording, we could have given you some useful tips for improvement, but at this point what you need is not to mess up whatever you're already doing. I could give some tips on how to properly form vowels and such, but you'd be too likely to overdo it and make things worse. The biggest thing you can work on at this point is not choking when you get up on stage. For me that always meant having practiced my piece until I could sing it in my sleep, but I got over my stage fright at a very young age. If you still get stage fright, you need to do whatever it is that helps you personally get around it, while still working on your audition piece.
Edit:
Also this:
Although more specifically, it's your diaphragm, not your gut. If your chest moves at all while you're breathing, you're doing something wrong, although this is a skill that usually takes someone who knows what they're doing being physically there to demonstrate it; I've never seen anyone get it properly without someone else physically correcting their posture and doing a hands on demonstration.BlackStar42 said:2 Breath control is EVERYTHING. Breathe with your gut.