To truly learn a language, as music is!, immersion is key.  The more children hear the music they will be learning, the easier it will be for them to "speak" it themselves.  Be sure to have your recordings playing as often as possible:  in the house, in the car, in their rooms, while playing, while eating, while brushing teeth!  This is a key element to your child picking up the nuances that make music a language-- we aim to teach them to speak fluently!  LISTEN & ENJOY!