I think Up In the Sky is a pretty hard song to sing. God knows Liam sure as hell couldn't sing it now. Actually now that I think about it, didn't Noel start doing all the falsetto in concert after 94?

Other hard ones I'd say are Whatever, Little By Little, Fade In-Out, Stand By Me just off the top of my head

Easy one's are def Songbird and Let There Be Love (aside from the bridge which is prob why Noel sings it)

And people wonder why they never do any live songs?

Hard (for me):Little by Little, Listen Up, Go let it out,She's electric

Easy:Up in the sky, Angel Child (but it's alittle hard to play)DYKWIM

And for Liam, well I think he can't many of the older songs nowdays, for example:

Champagne supernova, Stand by me, Listen up, and many others... it's pitty.-

For me its Don't look back in Anger, my dear dear husband decided to tell me I was exteremly out of tune in the middle of the MSG gig.... lol I just cant sing it

my mates a singer. he said he can't do she's electric well.. it's a hard one.

just practice really when am learning a new song i tend to sing it while playing so you can work out what timing of your changes to your own style it does mean repeating same bit over and over sometimes

hard to sing - fade in out

easy - whatever

hard - stop crying your heart out
easy - wonderwall (better when drunk)