and A, as scored in the clarinets and optional synthesizers, slowly transforms over time by adding pitches. This process is a concept of changing harmony, which Adams describes as "bring[ing] in a new key area almost on the sly, stretching the ambiguity out over such a length of time that the listener would hardly notice that a change had taken place". By measure 52, the aggregate of pitches suddenly shifts as the E major chord is replaced by a B-flat major chord. Meanwhile, the original pitch collection continues to exist as an unchanging force. This process is the main harmonic device that Adams employs, as the next section shifts pitch collections more rapidly for contrast, while other sections return to the pace of the first section. Rhythmic devices In its rhythm, this work adheres to the main precepts of minimalism, one of which is the use of repeated material, generally in the form of ostinati. Minimalism also favours a strong sense of pulse, which Adams emphasizes strongly in Short Ride in a Fast Machine in his scoring of the wood block. Adams claims that "I need to experience that fundamental tick" in his work. Throughout the course of the work, Adams experiments with the idea of rhythmic dissonance as material begins to appear, initially in the trumpets, and generates a new sense of pulse. As shown below, the manifestation of rhythmic dissonance is akin to Adams's method of creating harmonic dissonance as he adds conflicting rhythms to disrupt the metronomic stability of the wood block. Adams himself admits that he seeks to "enrich the experience of perceiving the way that time is divided" within his works. Later in the work, (see Example 5) Adams introduces a simple polyrhythm as a means of initiating a new section that contrasts the rhythmic dissonance of the first section. Formal devices The idea of formal closure and rhetorical devices in a sense of common practice is skewed in the works of John Adams, especially in Short Ride in a Fast Machine. While works of common practice organize material by phrases which are separated by cadential material, this work is in a state of perpetual motion as the additive element of harmonic and rhythmic material drives the work forward. The "gating" concept gives the overall work a sense of sectional design, but the indication of termination through cadence is something that is absent from the