Lady Gaga made an appearance at the Versace Versus Fashion Show 2013 where she was the musical director for the show. The music being played in the background is apparently from ARTPOP. Here's a few snippets. The quality isn't great but it gives you an idea and it sounds like a big electro mess to me.
Stefani also wore super high platform boots, because there no better way to screw up a hip ailment recovery by wearing gait killing shoes.