TONIGHT, 60 Minutes reaches for a new high with a breathtaking climb to base camp on Mount Everest. >> I am not looking down. Don't talk.Oh god, it's windy. I do not like this at all. >> We hiked 10 days into thin air.>> Welcome to Everest base camp. Our guides were the Sherpas who risk their lives to assist climbers. We found there's little margin for error on the journey to Everest.This is the setting that produced what is surely the most statistically improbable story in classical music history. Seven si ...