Who was VIP at St. Marks Recording Studio?

Around 8:30 pm Friday night, a big luxury tour bus, white Mazeratti and a fleet of black SUVs pulled up in front of the recording studio on St. Marks near Vanderbilt - the one a few doors down from Ample Hills. There were lots of security guys in suits unloading Louis Vuitton duffle bags, harried assistants and the typical entourage types. Anyone know who was there recording? From the scene it seemed like a VVIP.

dunno who but Complete Music is a rehearsal studio...don't do much recording.