Yeah! Defying Gravity is also like the main song in wicked, especially the ending when she goes "Aaaooh!" and the vocals are amazing, i always think elphaba's voice will crack but it doesnt, its really unbelievable! :D
Yeah, Im listening to it on my iPod right now, and I love how its set up. Like when glinda says "your having delusions of grandeur" she holds the note, and it overlaps with elphaba singing "I'M through accepting limits, 'cause someone says there so!" its very nice. And also idena, and many other elphabas, have different otnes of voices for each note which is really unique and doesnt make the song just straight singing.
Yeah! I love them all!! lol! Me and my sister would act out the songs of wicked.. i would play galinda and she would play elphie! we even got our own costumes! lol!