Namak Haram was released in 1973. This was indeed a good year for Pancham - with 19 releases. His compositions for the movies like Yaadon ki Baraat, Aa Gale Lag Ja, Namak Haram, Heera Panna & Anamika were instant hits & remained chart-toppers forever. On the other hand there were movies like Bandhe Haath where it took a long passage of time before its music got appreciated.
There were also mixed fares like Joshila - produced by Gulshan Rai (whose first production was Johny Mera Naam and whose son Rajiv Rai went on to make movies like Gupt & Mohra) and directed by Yash Chopra. The movie had that rare combination of Sahir & Pancham, yet except Kishore Kumar's outstanding rendition of "Kiska Rasta Dekhe", none of the songs really got the due recognition.
For example, this cabaret number, picturised on Padma Khanna. With a long prelude and longer interludes, the song is remarkable for its varying pace of composition as well as the vocal - which were rendered by Asha Bhosle. Listening to the number, one really wonders the reason for its not getting the kind of popularity which some of his other cabaret compositions could garner. Perhaps, again the reason could be that the movie itself turned out to be a dud - despite having Dev Anand, Hema & Rakhee as the lead cast.
Anyways, here is the number. I recommend that you must listen to it with earphones, to really enjoy the jamming of instruments in this not so often heard composition of Pancham: