9. 'Summer Rain'
Like "Big Girls Are Best," U2 recorded "Summer Rain" during the All That You Can't Leave Behind sessions and ultimately discarded it, though it did appear on some deluxe editions of the LP. The euphoric, acoustic tune has the vibe of a classic U2 song and would certainly have worked great onstage, but they've never gone near it. It's a shame. It really deserves a revival.