You're not the only one who cried upon first listen to that song, homie.One song impacted me the most.
I have said multiple times that this was not only my favorite Linkin Park song, but my favorite song ever. And for very good reason. I had a very hard bout with depression and really suffered through so much in my past. When I listened to the leak of ATS back in September, I really enjoyed most of the album...and then "Iridescent" came up and sealed the deal. Seriously. That was the first LP song that made me cry the first time through (and the second time through). It's like the band wrote the song specifically for me and everyone who went through what I went through. And I don't care what any of you guys say, but the gang vocals and the whole ending of the song are my favorite parts. I told myself "I found the perfect song." But I chose not to listen to it for a while, as it was too special for me to overplay.
A few months later, my girlfriend broke up with me over heart-breaking reasons to me. Of course, the two songs that really got me going were "Waiting for the End" and, yup, "Iridescent". That was the moment I started to overplay "Iridescent" (and I'm glad I did), and whenever that song pops up anywhere, I stop whatever I'm doing and just sing my heart out.
"Iridescent" was so special that I request this song to be the last song to play at my funeral when I die; that's how much this song means to me. A Thousand Suns was a total masterpiece, and once again, I thank Linkin Park for making the album of my life.