Sonu tasted real success in playback singing when he was invited to sing the song, 'Yeh Dil Deewana' for Subhash Ghai?s film 'Pardes'. This song made Sonu the real superstar, a heartthrob of Bollywood. He changed his style of singing and adapted the modern nuances of the western style of singing merging with our own Indian classical influences. Since then there has been no looking back for Sonu. Today he is among the highest-paid singers of Bollywood and almost 90 percent of the films have at least one song sung by him or the whole album. Sonu is in heavy demand because his voice suits every hero be it the Khan's (Shah Rukh, Salman and Saif Ali Khan) or The Bachchan's (Amitabh and Abhishek) or Hrithik Roshan or the newer lot like Shahid Kapoor and Zayed Khan. Shah Rukh Khan once commented ?I grant a lot of my success to Sonu.? Each and every filmmaker would like to sign him for their films because they think Sonu?s velvety voice is just enough to make their films super-hit. Sonu has worked with almost every music director and as rightly said by one of them "Sonu's singing is immaculate because he immerses himself completely in it. He comes to the recording studio, writes the song, learns it, sings it and leaves in nothing more than 30 minutes. I think no one can ever match his caliber".
He has sung countless songs not only in Hindi but in almost all the regional languages of India. 'Aur Pyar Ho Gya', 'Pardes', 'Dil Se', 'Border', 'Refugee', 'Sarfarosh', 'Taal', 'One Two Ka Four', 'Pyar Tune Kya Kiya', 'Lucky', 'Paheli', 'Parineeta','Chocolate?, 'Saathiya?, ?Kal Ho Na Ho?, ?Kabhie Alvida Na Kehna?, ?The Legend Of Bhagat Singh?, ?Lage Raho Munnabhai? to name a few films which have played a key role in polishing his singing career.