Some lesser-known Los Lobos tracks feature keen collaborations. Guitarist Cesar Rosas enlisted blues legend Willie Dixon to co-write the danceable R&B complaint "I Can't Understand". Mexican rock stars Café Tacvba add to the epic clave groove of "La Venganza de los Pelados". And Latino supergroup Los Super Seven reprise Lorenzo Barcelata's beautiful vintage love poem to Veracruz, "El Pescador".