With his booming basso profundo voice, singer/actor T. Mychael Rambo is the perfect narrator for a musical social justice tour: gospel, R&B, soul, jazz and songs from “Freedom Train,” a musical about Underground Railroad force Harriet Tubman. Singers include Ginger Commodore, Dennis Spears, Patty Lacy, Kevin Jackson and Rambo, backed by a band of faculty from Walker West Music Academy. (STAR TRIBUNE)