2 Flats - A very advanced key signature. The 3 sharps for beginners are gone.
Everything that was high 2nd is now low 2nd (F#, C# & G#)
Bb and Eb are low 1st on the D and A strings.
Not only is this hard to get the right fingerings but it's fast, really fast. And everyone knows it or at least has heard it played well.