Watch the Catfish online guitar lesson by Jeff McErlain from Blues Guitar Fakebook: Rhythm Vol. 2
To round it all out, let's take a look at the riff that to me, inspired rock 'n' roll. Muddy Waters' "Rolling Stone Blues", also known as "Catfish Blues".
This song is mainly a one chord riff staying on E. As you listen to this and the original, we can hear countless blues and rock 'n' roll riffs that were born at the moment when this was recorded at Chess Records in 1950.