According to an official press release for the album, Mike Diamond is responsible for pairing Camilio Lara (aka M.I.S.) and Horovitz. Lara says:
"I've been friends with Mike D of the Beastie Boys for a long time. So one night after one of their shows in Mexico City, I had the group over to my place for dinner. Mike introduced me to Ad Rock and I gave him some of my music from the new album that I had been working on. Months down the line, he got back in touch, saying that he wanted to collaborate."