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 songs All India Radio, Kolkata recorded songs  composed by well-known composers from the '50s and broadcast these songs regularly mostly in Medium Wave (MW). Only lately (post 2010) they have started broadcasting them in FM. All the other regional AIR stations did the same. AIR, Kolkata always had their own recording studio and  own group of musicians. Besides songs they also recorded many well-known instrumentalists, including famous Sitarists, Sarod players, Flute players etc. These recordings were never released commercially. This is why these songs are so rare. 
 Quite a few songs were released commercially by HMV or Inreco but majority of these songs were never released. All India Radio is a large beaurocratic organisation and always had quite strict rules regarding commercial distribution. Salilda had a special relationship with the management and he managed to get some of his songs released by often changing the lyrics or the music arrangement just to circumvent the law !  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||