Fact marries fiction in the new musical Cross That River, a tale about a runaway named Blue who escapes slavery in the 1860s to become one of America’s first black cowboys. Soulfully directed by Reggie Life, and starring jazz musician Allan Harris, Cross That River has music and lyrics by Harris, and a book written by Harris and his wife, Pat Harris. Although its musical patterns are mostly defined by a spirited jazz and blues vibe, there are also dashes of gospel, country and western, and African rhythms that pulsate in the vibrant songs.