Playing at the Soho Playhouse as part of the Fringe Encore series, Gil Scott-Heron’s Bluesology is a heartfelt tribute of spoken-word and musical performance full of angst and warmth, lovingly hosted by his daughter Gia Scott-Heron. Gil Scott-Heron, who died in 2011, was a spoken-word artist and musician, and the show presents 17 of his works from a career that extended from 1970 through 2010. Bluesology is how he described his work—he saw himself as “a scientist who is concerned with the origin of the blues.”