U2 may have had countless moments where they were on top of the world, but it took a tragic disagreement to put them in everyone's good graces.

These 10 songs define U2's half century-spanning career spent together, from their earliest post-punk days to their years of reinvention.

"My favorite U2 song and album." "Might be my top song of all time." Earlier today, they also dropped another lyric video on YouTube for "40." ...