Formed in Houston, TX in 1969, Gibbons was formerly with the band 'The Sidewalks' and Hill & Beard were from 'The American Blues Band'. They got together, and the following year they released their debut album, appropriately titled 'First Album'. ZZ Top r
This riff is intermediate because of the solo and the notes that are being played on the 'A' string during the main riff. The song is set at 160 bpm's, which is beats-per-minute.
In this riff you will be focusing on some palm mutes and a slide, as well as some 'vibrato.' Vibrato is when you rapidly shake the string being played with your fret hand as much as possible to produce a wah-like effect.