's is their first album of new material in five years. Written, arranged, and co-produced by the pair, they deliberately attempt to forgo the Latin influence in their music in favor of an all-rock (albeit still acoustic) approach -- which marks a return to their pre-recording roots in heavy metal. (That they don't entirely succeed is part of what makes so compelling.) Each tune was composed for a different inspiration: authors, philosophers, activists, scientists, and a queen. The set was exquisitely recorded in Mexico by . There isn't a dull moment in these 41 minutes. "The Soundmaker," for 19th century luthier and guitarist , commences with 's knotty riff and 's chugging rhythmic vamp. Two things are immediately apparent: that their collective playing style owes much to heavy metal -- where they came from before studying flamenco -- and, divorced from its bombast, metal is steeped in lyricism. "Torito," with its careening interscalar soloing and riffs, possesses some of 's most inventive rhythmic technique, slapping and frenetically strumming her guitar with controlled, yet passionate, aggression in dialogue and argument with his leads. Her cross-cut syncopations drive 's attack and melodic inventions in "Misty Moses" (for ), a tune that changes directions several times and shifts its central harmonic focus with dazzling clarity. "Somnium" (inspired by 17th century writer, feminist, and nun ) employs twinned, stacked melodies that move from allegrissimo to presto, and employ reverse arpeggiato, all the while overflowing with emotional resonance. On "The Russian Messenger," creates a menacing rhythmic attack of palm slaps on the wood of her instrument, interspersed with slashing minor sevenths; counters with delicacy in a flurry of lithe single notes. On "Megalopolis" (for poet ), Spanish music comes shining through in gloriously articulated fingerpicking, doubled melody lines, and a narrative structure that recalls Spanish folk music. "La Salle des Pas Perdus (for ) articulates musical themes from her "art of courtly love" era in the melody. The two guitars fluidly exchange tightly woven lines in nearly songlike interplay (here too, Anglo and Spanish lyricism entwine) before tempo and tension briefly increase, then dissipate elegantly. The dialogue that transpires throughout is lively, eloquent, and actively intellectual, but it is also intimate. Between them, engage in musical and even cultural queries, and sometimes -- provocatively -- leave them wide open. This album evidences an expanded creative reach for the pair, even as it re-engages the sharp edges they displayed on earlier recordings. [The bonus edition contains a DVD that features a "making of" documentary, live at Red Rocks footage, in-studio performances of album tracks, and a 30-minute tutorial from each guitarist.] ~ Thom Jurek