This Marks orchestration of Ernesto Lecuona's (1892-1934) zarzuela is, at once, the first-ever critical (to the extent that this is possible), and, more importantly, the first-ever performing edition. It utilizes all extant notated and aural materials for Maria la O for its creation. It was edited 2001-2011 by Dr. Evan Hause. The orchestration in this edition is fully computer-engraved. The percussion parts, mostly unnotated in the original materials, were transcribed and edited for this edition, yet they still allow forthe freedom to take a traditional, improvisatory approach to the music as per the original.