Martin Kierszenbaum, also called "Cherry Cherry Boom Boom",  who spent some days in studio with Natalia Kills and Madonna recording new tracks for Madonna’s new album talked about the collaboration during a radio interview with Larry Flick on SiriusXM.

Here’s what he said :

It was a huge honour. It was one of those wonderfully musical sessions that yielded a lot of music.
Madonna invited us [Natalia Kills & Martin Kierszenbaum, ndlr] to come and write with her for her next project.
We were supposed to be with her in the studio for a couple of days, but kindly invited us to stay a little longer. We had a great time. It was so much fun.

We don’t know what’s going to end up on the album.
She’s going to decide what she wants to do with it.
It was just a privilege to be able to contribute.

Madonna is so very musical. For me, being such a big fan for so long, it was so exciting to hear her vocal in the room, right next to me, sounding exactly like all of those records we all love.
She’s a pleasure to work with, because she’s also so in tune with who she is and what she wants to sing.

 

Martin Kierszenbaum is the senior executive of A&R label, at Interscope Records. In the past, he worked with Sting, Keane, Tokio Hotel, t.A.T.u... He also co-wrote and produced songs for Lady Gaga’s debut album. His nickname, Cherry Cherry Boom Boom, can be heard in some lyrics from Lady Gaga's songs !