The two grand old masters of the steel-string guitar produce music of such humor and energy on this 50-minute album, that one might suspect them being under the influence of some secret, stimulating tinctures brewed from an old Celtic herb garden. But in spite of the clearly audible "Celtic moments", it's no doubt the unbuttoned swing of this breathtaking twosome that gives "Duet" its indelible stamp. Whether it be slightly folkloristic blues, ragtime-style or rather jazzy numbers, Berryman's and O'Reilly's approach is filled with an enormous verve.