At other times, there???s a jaunty brother duet, ???Low Down,??? and the rockabilly number ???Last Stop On The Line.??? Those are countered by the Monroe mandolin licks and G-runs that color their song about being in a ???Bluegrass Band.??? Mixed in are a variety of softer, contemporary slow tunes, among them Becky Buller???s ???Bridges,??? Lisa Shaffer???s ???For Every Valley,??? and the most bea