Here is an interesting background on his famous song Mehbooba o Mehbooba which was adapted from Demis Roussos' (a Greek singer based in London) Say you Love me love me. Ramesh Sippy heard this song in London and created the situation for this song in the film Sholay.,
Pancham was innovative and probably the first composer to have tried fusion music . He even cut an album with Asha Bhosle and Boy George the British singer , which became very popular at that time reaching the top of the charts..
I tried uploading an image but was unable to do so since there was some problem in doing so ..
Here is the link that tells about the 12 classics scored bt Panchak