There is an Ogg Vorbis version of Shadowed from heaven's eye on the un-twelve web site, or an mp3 version (slightly rebalanced) on this site.
It is not the most cheerful piece I have written. The title is a quote from Titus Andronicus by Shakespeare, one of his most tragic tragedies. It tells the fictional story of Titus, a Roman general, who is engaged in a cycle of revenge with Tamora, Queen of the Goths. Titus kills his own son, and his daughter is raped and mutilated by Tamora's sons. He kills his daughter's attackers and serves them to Tamora in a pie. He then kills his daughter and Tamora; Titus and his killer are killed at the end of the play. There are also several other killings and limbs chopped off.
These are the technical notes I wrote:
Shadowed from heaven's eye was inspired by a performance of Titus Andronicus. Shakespeare's first tragedy is a violent story where cycles of revenge result in rape, murder and disfigurement. The most violent actions in the play are done "shadowed from heaven's eye" in a forest near Rome. By the end of the play, all the main characters have killed each other. Shadowed from heaven's eye is a passacaglia for winds and percussion. It is written in an octatonic mode consisting of two interlocked diminished chords a quarter tone apart. This provides two types of tritone-like intervals that are prominent in the passacaglia theme. The tonality of Shadowed from heaven's eye shifts between the two diminished-chord tone centres. There is also a prominent part for vibraphone that leans more towards a more conventional chromatic mode.