Learning a new song

Has Abi heard "It's a small world" sung before? We have the music playing on a wind up box but no words. Today during the drive from Strathfield to Gymbaroo, Priscilla sang the song 3-4 times with Pascale, Abi and Por Por in the car listening. During bath time Abi started to sing this song. She was hesitant at a few places so Priscilla sang with her. After a couple of repeats Abi was singing louder and repeated some phrases as she was dressed (eg. the opposites of world of laughter / tears; hope / fears; mountain / ocean.