Malcom Young easily one of the unsung heroes of rhythm guitar.  Everybody thought they had his riffs down but there was a wizardy in it's simplicity that made it more complex than you thought.  Trust me it makes sense if you don't think about it.  Today's Music Monday has me singing Hells Bells with Split Second. https://www.facebook.com/search/top/?q=Hells%20Bells%20split%20second