Little children can hear the sounds of more than 70 musical instruments with these delightfully illustrated sound cards. There are four double-sided cards showing groups of instruments from a cello to a didgeridoo and trombone. Slot a card into the frame, then press the picture of an instrument to hear its sound.Little children can hear the sounds of more than 70 musical instruments with these delightfully illustrated sound cards. There are four double-sided cards showing groups of instruments from a cello to a didgeridoo and trombone. Slot a card into the frame, then press the picture of an instrument to hear its sound.