Program note 

This piece, derived from an original chamber composition for two guitars and marimba, is distinguished by its remarkable evocative power, with subtle and poetic overtones that invite the listener to immerse himself in a sound world that is constantly transforming, precisely as the title suggests: a mutable echo. The essence of the work lies in its translucent nature, creating an atmosphere of delicacy and transparency that, on the guitar, allows it to be expressed with greater intimacy. With its apparent simplicity, it reveals an intrinsic complexity that invites an immersive musical experience. 

The piece is dedicated to guitarist Julio Isaac Cervantes, whose invaluable technical advice contributed significantly to its creation process.