When I was pregnant with Ethan, I used regular headphones to play music for him. I introduced him to Keith Sweat, Iron Maiden, Guns N' Roses, and classical music. I also had Maks speak Russian to him on a daily basis so Ethan would learn Russian and be familiar with Maks's voice. Needless to say we're going to do the same with Yoda, even though I think Yoda might