Dev Anand has directed 19 films and produced 35 films. Off the 35 films he produced, 18 were commercially successful at the box office and off the 19 films directed by him 10 were hits. He wrote the stories for 13 of his films. Critics say his directorial ventures have always been ahead of their time. Dev Anand's films are well known for their hit songs. He is known to have been an active participant in the music sessions of a number of his films. His association with music composers Shankar-Jaikishen, O. P. Nayyar, Kalyanji-Anandji, Sachin Dev Burman and his son Rahul Dev Burman, lyricists Hasrat Jaipuri, Majrooh Sultanpuri, Gopaldas Neeraj, Shailendra, Anand Bakshi, and playback singers Mohammed Rafi, Hemant Kumar and Kishore Kumar produced some very popular songs. Guru Dutt, Mohammed Rafi, Pran, Dilip Kumar, Raj Kapoor, Sunil Dutt, Nargis, Kishore Kumar, S.D. Burman and R.D. Burman were his closest friends from the film industry.