Shibani, known for songs like 'Sajna aa bhi ja' and 'Zinda hoon main', won director Surojit Ghosh's heart with her distinct voice and quick learning ability, said a source.
"Pa Ma Ga Re Sa" stars Rohit Roy, Gauri Karnik and Reshmi Ghosh in the lead and is a musical based on Amitabh Bachchan-starrer 1971 hit "Abhimaan".