So my 4yr old have discovered music on my phone. Great! I downloaded a couple of CDs of acceptable music for her and showed her how to access them. She was doing great, but then she realized, hey all of Mommy's songs are good too. Normally I don't mind that she jams to Mumford & Sons, Ke$ha, or Adele, but there are times (like at a church function) that I'd rather her not turn certain songs on. Is there any way to lock certain CDs? Or anything similar? TIA!