The Sonata by Ingrid Arauco is in four movements, with the first movement establishing a fundamental harmonic tension between two identical chord structures positioned a half-step apart, which introduced and developed at the outset, create friction and energy. The friction is never truly resolved in favor of either chord; rather, these sonorities are balanced in various ways. The momentum generated by the first movement is played out first as a quick, thinly-drawn scherzo, then as a slow, lyrical set of variations, and finally as a fugue, in which variants of the two opening harmonies of the work appear linearly and continue jostling for dominance, though in a generally more light-hearted manner than at the beginning of the piece. The entire sonata is approximately nineteen minutes in duration.