Ben Harper has released contemplative protest folk and electric guitar–driven rock, but at his core he's a songwriter centered on the distinctly American crossroads of blues and roots music. Perhaps that’s why he sounds so comfortable alongside a distinguished elder bluesman like harmonica legend Charlie Musselwhite. This collaboration of soulful tunes grew out of the deepest of blues traditions, but you’d be remiss to write it off as an old-meets-young nostalgia parade; Get Up! taps Musselwhite’s deep well of experience and Harper’s fiery energy for a righteous one-two punch of stomping roots rock.