Kumar Sanu got his major break when Gulshan Kumar with music directors Nadeem and Shravan gave him chance to sing most of the songs of movie Aashiqui (1990), songs were recorded earlier for an album and later movie was made around the songs.
The movie as well as the songs were a grand success.
Thereafter, they worked together in many films, including, Apmaan Ki Aag 
(1990), Saajan (1991), Phool Aur Kaante (1991), Dil Hai Ki Manta Nahin (1991), Sadak (1991), Pyaar Ka Saaya (1991), Saathi (1991),Jaan Ki Kasam (1991), Deewana (1992), Dil Ka Kya Kasoor (1992), Jaan Tere Naam (1992), Sapne Sajan Ke (1992),Anaam (1992), Paayal (1992), Panaah (1992),  Bekhudi (1992), Kal Ki Awaaz (1992), Dilwale Kabhi Na Hare  (1992),  Hum Hain Rahi Pyar Ke (1993), Sainik (1993), Junoon (1992), Balmaa (1992),Waqt Hamara Hai (1993), Rang (1993), Dil Tera Aashiq (1993),Tadipaar (1993),Sangraam (1993), Shreeman Aashiq (1993), Dhartiputra (1993),  Kaise Kaise Rishte (1993),Aadmi Khilona Hai (1993),Divya Shakti (1993), Damini (1993),Dilwale (1994), Stunttman (1994),Aatish (1994), Salaami (1994),Chhoti Bahu  (1994)Ekka Raja Rani (1994), Saajan Ka Ghar (1994), Kranti Kshetra (1994), Andolan (1995), Gaddar (1995),Barsaat (1995), Anokha Andaaz (1995), Saajan Ki Baahon Mein (1995), Zamaana Deewana (1995), Raja Hindustani (1996), Agnisakshi (1996), Majhdhaar (1996),Himmatvar (1996), Jeet  (1996),Saajan Chale Sasural (1996), Pardes (1997), Naseeb (1997), Aa Ab Laut Chalen (1999), Sirf Tum (1999), Dhadkan (2000), Kasoor (2001), Hum Ho Gaye Aapke (2001), Ek Rishtaa: The Bond of Love (2001), Yeh Dil Aashiqanaa (2002), Ansh (2002), Haan Maine Bhi Pyaar Kiya (2002), Dil Hai Tumhaara (2002), Tum Se Achcha Kaun Hai (2002), Dil Ka Rishta (2003), Qayamat (2003) Footpath (2003), Andaaz (2003), Indian Babu (2003),Hungama (2003),Sheen (2004),Hatya (2004),Gumnaam (2004),Barsaat (2005), And Mere Jeevan Saathi (2006),Sanam Teri Kasam (2009) .
He has sung his most songs for them (293 songs).
Kumar Sanu got his major break when Gulshan Kumar with music directors Nadeem and Shravan gave him chance to sing most of the songs of movie Aashiqui (1990), songs were recorded earlier for an album and later movie was made around the songs. The movie as well as the songs were a grand success. Thereafter, they worked together in many films, including, Apmaan Ki Aag 
(1990), Saajan (1991), Phool Aur Kaante (1991), Dil Hai Ki Manta Nahin (1991), Sadak (1991), Pyaar Ka Saaya (1991), Saathi (1991),Jaan Ki Kasam (1991), Deewana (1992), Dil Ka Kya Kasoor (1992), Jaan Tere Naam (1992), Sapne Sajan Ke (1992),Anaam (1992), Paayal (1992), Panaah (1992),  Bekhudi (1992), Kal Ki Awaaz (1992), Dilwale Kabhi Na Hare  (1992),  Hum Hain Rahi Pyar Ke (1993), Sainik (1993), Junoon (1992), Balmaa (1992),Waqt Hamara Hai (1993), Rang (1993), Dil Tera Aashiq (1993),Tadipaar (1993),Sangraam (1993), Shreeman Aashiq (1993), Dhartiputra (1993),  Kaise Kaise Rishte (1993),Aadmi Khilona Hai (1993),Divya Shakti (1993), Damini (1993),Dilwale (1994), Stunttman (1994),Aatish (1994), Salaami (1994),Chhoti Bahu  (1994)Ekka Raja Rani (1994), Saajan Ka Ghar (1994), Kranti Kshetra (1994), Andolan (1995), Gaddar (1995),Barsaat (1995), Anokha Andaaz (1995), Saajan Ki Baahon Mein (1995), Zamaana Deewana (1995), Raja Hindustani (1996), Agnisakshi (1996), Majhdhaar (1996),Himmatvar (1996), Jeet  (1996),Saajan Chale Sasural (1996), Pardes (1997), Naseeb (1997), Aa Ab Laut Chalen (1999), Sirf Tum (1999), Dhadkan (2000), Kasoor (2001), Hum Ho Gaye Aapke (2001), Ek Rishtaa: The Bond of Love (2001), Yeh Dil Aashiqanaa (2002), Ansh (2002), Haan Maine Bhi Pyaar Kiya (2002), Dil Hai Tumhaara (2002), Tum Se Achcha Kaun Hai (2002), Dil Ka Rishta (2003), Qayamat (2003) Footpath (2003), Andaaz (2003), Indian Babu (2003),Hungama (2003),Sheen (2004),Hatya (2004),Gumnaam (2004),Barsaat (2005), And Mere Jeevan Saathi (2006),Sanam Teri Kasam (2009) . He has sung his most songs for them (293 songs).
Kumar Sanu