Question: Abar Bochhor Tirish Pore was organized in part in memory of an Indian Bengali singer, songwriter, bassist, and composer, who co-founded what progressive rock band?
Sentence (from "Abar Bochhor Tirish Pore"): Abar Bochhor Tirish Pore (Once again after thirty years), a tribute concert featuring songs of Moheener Ghoraguli with Philarmonic Orchestra, was held at Nicco Park, Kolkata on January 5, 2008.
Relevant evidence: No