#upbeat

• Anacrusia — The character or state of a composition, verse, or rhythmic phrase that structurally begins with an anacrusis; the formal property of a metrical or melodic system to place unaccented elements (pickup notes or atonic syllables) before the first downbeat or ictus. This aesthetic phenomenon dictates a more fluid flow and a progressive launch of the general rhythm.
• Arsis — The accented part of a musical measure or of a metrical foot in ancient Greco-Latin poetry, representing the moment of raising the voice or the hand during conducting (opposed to thesis). In modern metrics, the term defines the structure of the strong syllable or the downbeat within a poetic or musical rhythm, playing a fundamental role in organizing the cadence and harmony of artistic compositions.
• Upbeat — A secondary and less frequent orthographic variant of the term 'auftakt'. This neologism of German origin is used in music theory to designate an unaccented note or group of notes preceding the first complete bar of a piece; an anacrusis. In performing arts and project management, it is used metaphorically to describe an introductory event.
• Auftakt — A technical term of German origin used in musicology to designate the anacrusis or upbeat. In an extended and modern sense, frequently used in corporate, cultural, or journalistic jargon, it designates a launch event, an initial kick-off meeting, a prelude, or the official debut of a major project.