This is the intro riff of Glasgow Kiss from John Petrucci's solo album, Suspended Animation. If you like Dream Theater but haven't checked out his solo album yet, it's full of great guitar playing.
This riff in E Mixolydian is a great way to develop your picking and string muting control.
If you're not familiar with modes, this lick is a good example of Mixolydian in action. On my website, I explain what makes this lick Mixolydian as well as what it would sound like as a Major lick.
Learn more about the technique and music theory behind this riff here: www.aaronmatthies.com/licks/g...
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