Finger Tapping

Or just known as tapping, is a guitar technique popularized, but not invented, by Eddie Van Halen and is usually used in Hard Rock and Heavy Metal. This technique easy to some extent and beginners often use it to impress other people since it is so easy yet so hard-looking. This technique is essentially hammering-on and pulling-off through use of both hands, tapping can range from 2 fingers (Surfing With The Alien) all the way to 10 fingers (Buckethead live). The first song to use tapping that I know of is Dirty Deeds Done Dirt Cheap by AC/DC in 1976, even though Angus Young doesn't tap it live, he originally tapped the solo in the studio to make it a lot easier to play correctly without a lot of extra string noise, but over the years he definitely mastered it with just hammer-ons and pull-offs. Others have claimed that 50's blues and jazz musicians have used tapping as well.