Your baby now has a knack for developing his sense for hearing in different stages. While he will recognise your voice soon after birth, there will come a stage when he becomes aware of the sound of music around him. Gradually, as his hearing improves, he will be able to express his liking towards a song by smiling.
What you need to do
Let your baby hear a number of nice lullabies and songs and watch out for his reaction. You will soon come to know which songs he likes and does not like, by his expressions and his response.