 Complete the following phrase:  Sky Wikluh, popular Serbian composer and rap musician, wrote a song for her, named Moja noć, with production done by Gru. This song was one of the reserves for the Beovizija 2009, if someone of twenty contestants decided not to take part in. Kostić also sang as backing vocal for Reginas song Bistra voda, which represented Bosnia and Herzegovina in the Eurovision Song Contest 2009. On 1 July 2009 Kostić performed Bože pravde, the anthem of Serbia, alongside two more singers at the opening ceremony of 