Glastonbury is these days predominantly a rock festival, if you believe those that wanted to keep Kanye West from performing.
The truth is the festival has always been a folk/roots festival that grew to include all other aspects of music.
Nowhere is this more obvious than the abundance of dance acts that perform each time and the fact that dance music has it's own dance village (now named Silver Hayes).
This is far from a complete list, more a cross section of the styles that are on offer across the main stages to the tiniest tents.
High Contrast, Joy Orbison, Wilkinson, Leftfield, Fatboy Slim, Borgore, Modestep, Deadmau5, Chemical Brothers, Rudimental, Sigma, Goldie, Mike Skinner, Mickey Finn, Skream, 808 State, Toddla T, Eat Static, Andy Butler, DC Breaks and many, many more.