In reply to:
U2 justified their appearance with two songs off their last[album]
Not sure U2 need to or can be bothered with justifying anything they do anymore but that's a by the bye.
1. The Recent Song. Seems to me, the lyrics ("Devil in a market place/Devil in your bleeding face"etc ) to Fall Dog Bombs the Moon make it a particularly apposite, if not perfect opener.
Alternatively - being the cash hungry greedhead he can be at times - he could use the opportunity to push his (hypothetical) new single (She Can't) Do That - giving it a nice dryly humorous introduction such as:
"This is a song from a film made to glorify the Stealth Bomber and the US military. Cos, y'know, that's what us rich westerners would rather do instead of feeding poor folks. Invent new and exciting ways to blow shit up and then make piece of shit films justifying the whole thing. What am I doing on the soundtrack with this shitty little song, you ask? Well, I'm a global media corporation in my own right these days and, you know how it is, corporations gotta have product to push to people."
2. The Duet. Something of a reprise of an awards show "spectaculah!" he sleepwalked through a couple of years ago - I would go with Muse singer Matt Bellamy and a glammed up, pomptastic version of T-Rex's Children Of The Revolution - complete with children's choir on the chorus.
3. The Classic. "Heroes". Gotta be, hasn't it. With the childrens choir from no.2. above and images of starving people being fed hamburgers all round the world. "Thanks Very Much. Y'all have a guilt-free day now."
"Let it stay Forever Now"