Hey, I am Markus and Im from Norway. I just had an idea, what if David Guetta and Katy Perry made a song together? It would be the best song! Katy Perry is the best female singer, and David Guetta is the best DJ in the world. What do you guys think? And I really want David to see this idea so maybee he would contact Katy.
Thats the great idea! I don't mind 
perfect voice & perfect remixer song will be great
That would be cool - but she has to make the contact, that's how it works for most artists. 
There was a rumor that "Titanium" was planned for Katy Perry, but that rumor isn't true. David said so in an interview in South Africa.
Yeah katty n David can do it more better.....great idea!
that could be the tune of the century .. she always releases a song that is unlikeable and guetta never fails to make good music!
That's actually a very pleasant idea.
I can't imagine how great a song would be with David and Katy.