Guillermo Gregorio's "Approximately," released in 1996 under the hat ART CD label, is a captivating journey into the world of free jazz and avant-garde music. This album, spanning 54 minutes, is a testament to Gregorio's deep involvement in the avant-garde scene, particularly in Chicago, where he collaborates with notable artists. The tracklist, featuring pieces like "Two Ambiguities," "Aural," and "Equilibrium," showcases Gregorio's innovative approach to composition and performance. His work often pushes boundaries, exploring sounds that are commonly overlooked in mainstream music, making "Approximately" a unique and thought-provoking listen. The album's genres, free jazz and avant-garde, reflect Gregorio's experimental and unconventional style, offering listeners a fresh and engaging musical experience.