Your topic encouraged me to contribut here. I know couple of MDs that are not known to many due to various reasons.My first MD is Chick Chocolate. He was an assistant to few famous MDs such as C.Ramchandra and Shaker Jaikishan. He composed music to 3 songs that I know. Here is the list.
01) Aa teri tasveer banaaloo (Talat in Movie Nadan under the umbrella of Shankar Jaikishan)
02) Koyee Dard hamaaraa kyaa samajhe (Lata in Rangeelaa)
03) Kahate hai pyaar kisako panchee (Lata/Chittalka in movie Baarish under C.Ramchandra)
My second MD is Dattaa Davjekar who was a very famous MD in Marathi film industry. He gave music to only one Hindi movie named "Aapkee Sewaame. His compositions were mostly classically based. There are two songs one by Lata and the other by Mohan Tara and Rafi
My 3rd MD is Keshavrao Bhole who gave music to a very old movie named Amrit Manthan. 2 songs both sung by Shanta Apte.
Sudheer Phadke was by no means a B grade composer. He gave music to numersous Marathi movies and every one of them was a tremendous hit. He gave music to Bhabhiki Chudiyaa and 6 more movies in Hindi. There are other less known Marathi MDs such as Kishori AmoNkar.
If you go to giitaayan and look under Music Directors, there are 100s MDs that are totally unknown.
Govind Deshmukh