The hidden art of musical decoration: why notes aren't always what they seem

The hidden art of musical decoration: why notes aren't always what they seem
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In short: In the Baroque era, a written melody was merely a skeleton. Performers were expected to breathe life into the score using ornaments—flourishes that decorate a line without altering its essential structure. From rapid trills to 'crushing' notes, these embellishments transform a simple melody into a virtuos and expressive masterpiece.

Musical ornamentation ranges from a single, brief grace note to the flamboyant, rapid alternation of a trill, also known as a 'shake'. During the Baroque period (1600–1750), ornamentation was often extensive and frequently improvised. A singer performing a da capo aria, for instance, might present a relatively plain melody the first time, only to decorate it with intricate flourishes and trills during the repeat.

The terminology and execution of these flourishes are notoriously complex and vary by era, region, and composer. For example, the 'mordent'—a rapid alternation between a note and its neighbor—is a source of historical confusion. In the Baroque period, a 'mordant' often referred to what we now call a lower mordent, whereas 19th-century practice applied the term to the upper mordent. Similarly, the 'acciaccatura' derives from the Italian 'acciaccare', meaning 'to crush', reflecting its 18th-century use as a note struck simultaneously with a chord and immediately released.

Beyond simple notes, more structural ornaments exist, such as the 'turn', which involves a sequence of notes above and below the principal tone, and the 'glissando', a continuous slide through all intervening notes. Even the 'Nachschlag' (literally 'after-beat') can refer to notes that terminate a trill or supplementary notes that 'steal' time from a main note. Because notation and practice vary so widely, many composers even included their own personal 'code' of ornaments in the prefaces of their scores.

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