Okay, favorite parts:
For Howie, it's his verse of Show Me the Meaning:
"There's nowhere to run, I have no place to go. Surrender my heart, body, and soul..." I've always loved how he sings it live, the run he does on the word "soul." Example:
https://youtu.be/05Xatd_5WS4?t=4m7sFor Brian, it's his solo in More Than That right before the last chorus:
"I will love you more than that, I won't say the words, then take them back." https://youtu.be/1OwfYjemrYw I've always thought that was the most beautiful section of the whole Black & Blue album.
For Kevin, it's a tie between his verse on Drowning (especially
"Love me mouth to mouth now") and his verse on Show 'Em What You're Made Of (especially
"Like a lion, I will survive"). I love both parts lyrically as well as musically.
For Nick, I'd probably have to go with the chorus of Incomplete, especially when I can watch him sing it to see the angsty facial expressions. Bonus points for doing the "Oh-oh-ohh..." after the last "incomplete" (which I cannot for the life of me find a video of), and double bonus if he drops to his knees onstage.
I had the hardest time with AJ, but I finally realized it's his verse in Take Care, especially
"I can hold you while you cry, you know!" That is one of my favorite parts of the whole IAWLT album.
Honorable mention goes to Kevin and Howie for their verses at the beginning of Feels Like Home, especially Howie's
"Senoritas greet us sipping margaritas on the beach..." I've always loved how that line sounds, and I love how Kevin sounds in general on that song!
And another honorable mention for favorite duet goes to Kevin and Brian in Nobody But You. I only listen to that song for their part together...
"Somebody tell me cause I can't eat or sleep when you're not close to my body, you're a bittersweet delight... come and help me through the night." That is not one of my favorite songs, but I will rewind just to listen to that part over again.