The folks at mojo.com (who can make a list out of any topic in the world and eventually will) pick their Top 10 Hardest-to-Sing Broadway Tunes. I might have included "Out There" from Barnum not because it's vocally difficult but because in the show, the guy playing the title role has to sing it while walking across a tightrope. Let's see Patti LuPone do that…