They've yet to invent the musical instrument that can move us more than the human voice. Great singers convey a world of emotion in a single note, turn simple melodies into symphonies and imbue the most straightforward lyrics with the depth of a Russian novel. Check out our picks for seven of the greatest singers of all time. <i>Read the full story: <i><a href="http://www.laweekly.com/music/the-20-best-singers-of-all-time-video-6686064">The 20 Best Singers of All Time</a></i>