Enrique Arbós's five orchestrations of pieces from Iberia, the masterly piano work by his close friend, Isaac Albéniz, are among the most frequently programmed works in the Spanish orchestral repertoire today. Increased academic interest in Albéniz's orchestral output has revealed that Arbós's orchestration of Albéniz's piano solo, "El Puerto," from Iberia, bears striking similarities with Albéniz's unpublished orchestration of the same piece. Although Albéniz asked Arbós to take over the task of orchestrating "El Puerto," little is known about the details of this arrangement. To shed light on this issue, I have carefully reviewed the overlapping biographies of these two composers, as well as thoroughly analyzed the two scores for the first time. I conclude that Arbós's orchestration of "El Puerto" is indeed a revision of Albéniz's orchestration, and that this revision was a natural result of their close relationship.