Today's famous riff comes from a relatively obscure guitarist named Eric Clapton when he was in a band called Derek and the Dominos.
Even though you have probably never heard of him, I think his signature riff that opens his song Layla is one that every guitarist must know. :D
All joking aside, the intro to Layla by the imitable Eric Clapton provides an excellent exercise in legato, quick chord shifts, bending and vibrato.
You really have to work on the proper vibrato and bending technique to make the upper octave melody sing.
But because this is such a great song, working on it should be quite pleasurable to the ear throughout. :)
This Layla guitar lesson video starts with the famous opening riff in the lower octave. There are lots of moving parts to this riff so be sure to follow along with the video closely to see how to accurately play all of them.
After that we move to the upper octave riff section that is instantly recognizable and I personally never get tired of playing it.
Pay close attention to the timing of the hammer-ons and pull-offs since doing those too fast can throw off the rhythm. Then of course there is the responsibility of keeping all the bends in tune while still applying a nice vibrato to the notes.
All in all there are a few parts of this Layla guitar lesson that will challenge most players. But that is a good thing right? We are all here to get better and what better way than playing what is one of the greatest guitar based songs of all time. :)