Deadmau5 - Deadmau5 Still Upset With Madonna Over Alleged Mdma Reference

The Material Girl asked the audience, "How many people in this crowd have seen Molly?” - an apparent reference to rave pill Mdma, aka Ecstasy, prompting Deadmau5, real name Joel Zimmerman, to call her "irresponsible".

In a series of tweets following the festival, he wrote, "At the end of the day, it's a slap in the face... associating a potentially harmful substance to the work and passion we put in to make art... Are you so f**king uncreative after a 30-year career you have to resort to drug references?"

Madonna responded to the attack and explained she wasn't making a reference to drugs, but instead talking about a song called Have You Seen Molly?

She sent Deadmau5 a message via Twitter.com with a picture of herself dressed in Minnie Mouse ears with a speech bubble which read, "From one mouse to another. I don't support drug use and I never have. I was referring to the song called Have you seen Molly? written by my friend Cedric Gervais who I almost worked with on my album."

She later added, "Communication is always best. You should have called me first, we could have cleared it up 'privately'. See you on the road."

Deadmau5 appeared to accept he had made a mistake, tweeting, "Fair enough, I was just voicing my concerns as I usually do... Respect for clearing it up personally."

But it seems he's having trouble moving on past the Twitter feud - in a new Rolling Stone magazine expose, he brings up his Madonna spat and states, "You want to be hip and cool and 'funky grandma'? Fine. It's not my place to say you're irrelevant. If you're gonna come into my world, at least do it with a little more dignity.

"I understand she (Madonna) has millions more fans, and is way more successful than I'll ever be. But it's like talking about slavery at a f**king blues concert. It's inappropriate."