Days after releasing the trailer of Raanjhanaa,film's makers are out with the first song Tum Tak featuring Sonam Kapoor and Dhanush. Rajinikanth's son-in-law and Kolaveri Di actor Dhanush is making his Bollywood debut with Raanjhanaa directed by Anand L Rai of Tanu Weds Manu fame. The song showcases the teenage romance between the two protagonists played by Sonam and Dhanush. Tum Tak has been sung by Javed Ali and Keerthi Sagathia. The movie has music by Oscar winning director A R Rahman. Hours before the release of the song,Dhanush had tweeted: "Raanjhanaa first song trailer releases at 12. a r rahman sirs magic continues with "Tum tak". A perfect happy day. Raanjhanaa first song trailer.. everybody's love story." In the song,Sonam is dressed in a check school uniform with two plaits whereas Dhanush plays a youngster from Varanasi,madly in love with his neighbour played by Sonam. Besides Dhanush and Sonam,the movie also has Abhay Deol in an important role. Raanjhnaa,produced by Eros International,is set to release on June 21. Watch the song: