I am a lil confused with what the Judges mean by "singing in Sonu's voice"!
Sonu has a voice quality quite like Mohd. Rafi and he was often compared to the legend himself. Now Emon is being compared to Sonu....
When Sonu sang "Aaj ki raat mere, dil ki salaami le le" it was almost as if it were Rafi Saab singing it.... Thats because our ears have been attuned to hearing Rafi Saab sing that song. Had Sonu tried to change any harkat in it, immediately we would pounce on it saying that he tried to change the song, or he did not take it quite as beautifully. The true mettle of any singer will be revealed only in a song which he / she will sing independently, which will be known as HIS/ HER song.
They give Emon a Sonu Song and then when he sings, they say he sings like him If he were to change anything in the song, they will say he did some harkat which may or may have have gone well.
Koi kare toh kya kare