I'm a really bad person to try and guess these because you could give me the entire chorus of a lot of songs I know and I still wouldn't know what the name of the song is. Plus I'm always more of a melody than a lyrics person, so that doesn't really help me either. :) That said...

#1: rings a bell, a bit, but no idea where or what.
#2 took me a minute. I could hear it, but I couldn't place it or finish the song. I know it's from Wicked, I know it's Elphaba, at the end. It's probably the best known song from there, gimme a minute, the title will come to me when my mental iTunes finally stops skipping and gets to the chorus.
#7, I can sing that line, but I can't even tell you whether it's a pop song or movie soundtrack or musical, much less finish the next line. It's something I hear a lot, which makes me think modern radio song since I haven't had Broadway in rotation in ages...
#8, that's not Wicked again, is it? It took me until now to remember "Defying Gravity", there's no way I'm going to remember what that one is.
#9, ooh ooh, that one I can do! :D "Scarlet".
#10 I think is another SCA song? Or a musical.

It's official, I suck at lyrics. ;) Did I ever mention I'm really bad with names, too?

I'm really bad at names, too.