Basically known as Bengali FM Rainbow, set 1074 Mhz to listen to FM Rainbow Kolkata, including Hindi, International music (English music) they also produce some Bengali shows for their audience Shows like FILM UNLIMITED, TOLLY BOLLY SAMBAD, GAANER LAWRAI, KOTHAY HARIYE GELE, AFTERNOON PATROLEKHAR SURE FILM UNLIMITED, TOLLY BOLLY SAMBAD, GAANER LAWRAI, KOTHAY HARIYE GELE, AFTERNOON PATROLEKHAR SURE which makes FM radio a fully Bengali language based Radio. RJ's from the Rainbow India, according to a source, their Radio jockey's are not that good but some exceptions such as Reshma RoyChowdhury, Biswadip Mitra, Mohua Sarkar, Keya Mukherjee, Ayantika can make your day and night ;)
keep listening, Enjoy