According to Sir Isaac Newton, the “aether” was a medium which permeated all of space, which enabled all light and energy to traverse through it. In his piece for percussion ensemble Aether, Francisco Perez attempts to encapsulate this concept through the use of bright and shimmering instruments like crotales, glockenspiel, vibraphones, triangle, and chimes. Although the piece is meant to portray the nebulous aspects of the universe, there is a deep underlying group present in the piece, largely due to the ad lib. djembe part. Aether was commissioned by William Register and the Ashley Ridge High School Percussion Ensemble. This piece comes as a professionally printed and bound score and includes individual parts in PDF format for printing or for tablet viewing.