another know-all from me:
Falsetto is a term used only for male voice, whereas girls are often heard singing something of a similar tone, it is not actually falsetto.
I like to think of falsetto the same way we think of ghost notes or artificial harmonics on guitars. Which is why is sound toneless, or timbre-less, as if it has no different harmonic levels. When you sing on falsetto to an extremely high pitch, somewhere near the end of the piano, you find that the falsetto actually sounds more instrumental then vocal, like a violin of sort.
Attaining falsetto:
Falsetto is easily achieved by tightening your thoat on a normal note. Try holding real voiced note and then slowly increase the tension in your throat till your voice sort of cracks. That's where get a gay-sounding voice, it should sound kinda girly and crap you know. If you can get that then hold the cracked note, that would be your falsetto.
Some people find it hard to change quickly, so if you use the tightening method you should be able to figure out the change very fast. Use that method for parts like SOAD's Cigaro where it goes "can you see that I love my c*ck".
Falsetto requires very little breath to hold as it's mostly cord work, but still it takes alot of preparation to jump to a falsetto from a real voice note if you're not well trained. When singing a falsetto note, do not think of the falsetto. You should sing the real, lower note that you can reach with your voice in your head. That way you can stay rooted to a note you can achieve and note strain your vocal cords into hitting something false and hence going off tune.[/b]