When compared with the other parts, the middle section, "pi lento", is completely different -- the piece modulates between minor to major and increases tempo.
en.wikipedia.org If the exposition starts in a minor key, it typically modulates to the relative major key, or less commonly, the minor dominant.
en.wikipedia.org Consequently, all modern monolithic tunable lasers, widely tunable lasers, externally modulated lasers and transmitters, integrated receivers, etc. are examples of photonic integrated circuits.
en.wikipedia.org Self-oscillators are therefore distinct from forced and parametric resonators, in which the power that sustains the motion must be modulated externally.
en.wikipedia.org She said she would modulate tax on companies depending on if they use it for re-investment or to redistribute the profits to the shareholders.
en.wikipedia.org