Double LP housed in a gatefold jacket and features a second LP of rarities from the Mingus Ah Um Sessions. Mingus Ah Um, the artist's 1959 debut for Columbia is one of the most consequential albums in jazz or any other genre. The release is part of the Library of Congress National Recording Registry and has been inducted into the Grammy Hall of Fame. Goodbye Pork Pie Hat , Boogie Stomp Shuffle , Open Letter To The Duke the release is packed with classics and is a best-selling release to this day.