ok, so you have three voices (both males and females)
Voice #1-Chest. This is youre brute belting voice, and is in the lowest part of youre range. Its fine to "belt" here if you are doing it down the scale, but belting higher in this voice is VERy dangerous, and isn't pretty to listen to.
Voice #2-Head- This is where you sing most "soprano" pieces, and can be mixed with you chest voice for that typical sheri renee scott belt voice. most classical singing is done in this voice, with the exception of some higher parts which is done in.....
Voice #3!- Loft/Falsetto voice- This is where you sing those ridicuosly high notes.
Passagio is the place between the voices. This can always expand, but it will also always be there. Working through your passagio is a good thing because it leads to a well blended slide through the voices.
Examples of where certain songs would probably be sung-
"These are my Children"-Fame (chest)
"Still Hurting"- The Last Five Years (chest and head mixed)
"If I Loved You"-Carousel (head)
"Glitter and Be Gay"-Candide (head and loft)
...and there often isn't any song that is sung COMPLETLY in your loft voice. MAYBE some opera, but again, its usually for hitting those "money" notes.
Hope this has been helpful.
Hey there, you with the stars in your eyes.