Loose Id is a single-movement composition for brass quintet and percussion—later expanded for orchestra—by the American composer Steven Bryant.
The original brass quintet version premiered November 1995 at the University of North Texas and the full orchestral version premiered at Alice Tully Hall, New York City on April 1, 1997, with conductor Jeffrey Milarsky leading the Juilliard Symphony.
Unleashed, without the counterbalance of Ego or Superego, the Id generates unbridled instinctual energy, resulting in an orgiastic frenzy.
Distinct from a state of dementia, this piece represents a thoroughly lucid and intentional rampage of self-indulgence.
[2] AllMusic praised the composition as "an exhilarating piece of writing that, in its short, four-minute timespan isn't likely to wear out its welcome under any circumstances.