David Bromberg and his Big Band bring exuberant vocals, ace musicianship and a new album, “Big Road”, to The Colonial Theater. Still pushing boundaries, still an iconoclast, still unapologetically unique, Bromberg continues to explore his life’s journey via a path that might be considered “asymmetrical.” His musical expression is still inimitable, his scope of musical knowledge is encyclopedic and the album, a value-added collection of country, folk, blues and bluegrass.