Singing is really hard - way harder than guitar for me, and theres a lot of mystery associated with it, but I definitely know for sure that anyone can sing. Saying someone can't sing or learn to sing is like saying some people just can't learn to speak Spanish no matter how hard they try - or maybe its more like some just can't speak Spanish loudly. Which is crazy.
For me my teachers in college always threw around words like "tension" and "support" and "the breath" and I guess yeah once you have your own handle on the sensations happening in your own guts and throat that you can adopt those words, but its just so personal that you really just gotta fumble around and screw it up for a long time until you figure out a good feeling happening inside. Teaching someone to sing with words is like me trying to teach someone to play the guitar over the phone: "yeah sounds pretty good, so I assume you're doing something right.." Obviously I would just show them with my hands but unfortunately this is kinda impossible cause everything is annoyingly hidden underneath your skin and muscles.
One lesson I can say is that tone... and by that I mean what your voice sounds like is a combination of 4 factors (at least) according to my notes. What consonant the word starts with, the vowel, how high the note is, and how loud your trying to sing it. So you're trying to juggle these things all at the same time and once that word is done you need to move on to the next one in real time rapid fire! And sometimes a single word has several notes happening all over it! Its also like a rubik's cube because everything could be feeling good but then you change one of those factors and the rest might freeze up. Then theres the mother of all factors that obliterates the others - fear of someone actually hearing you. No matter how awesome you think you sound or how great it feels alone, if you freak out because someone is listening to you then your notes will just fall apart like Jenga. Thats why you should move to Japan and practice - because here no one cares if you sound bad, and if you can sing in English you're freaking awesome!
My new amp I bought online for 60 bucks and is set to UK 70's w/ the reverb on.
Ishida