When a perfume lists 'amber' or 'musk' as a note, it is almost never a single material. It is a constructed accord. This distinction matters.
An accord in perfumery is a blend of two or more aromatic materials that, when combined, creates a new unified scent impression — one that does not necessarily smell like any of its individual components.
It functions as a building block within a formula. A perfumer does not add "amber" to a formula as a single ingredient. They construct an amber accord from labdanum, benzoin, vanilla, and resins — adjusted until the combined impression reads as "amber."
Similarly, a musky accord may use multiple synthetic musks (polycyclic, macrocyclic, linear musks) at calibrated ratios to create a specific register of clean, soft, or animalic warmth. An accord is a formula within a formula. Many commercial perfume houses protect their house accords as proprietary compounds.

FACTS
Aftel (Essence and Alchemy) defines accord construction as one of the central technical skills of perfumery: building materials that create a recognisable scent impression from components that individually do not produce it. She contrasts this with raw ingredient use — a single-material note versus an engineered impression.
Groom (The Perfume Handbook) documents amber as the most widely used accord template in fine fragrance: it is defined not by a natural material called "amber" (no such aromatic material exists from fossil resin) but by a constructed accord of warm, balsamic, resinous, and sweet materials — with labdanum as the typical primary component.
The Northwest School of Aromatic Medicine (Core Principles of Perfume Formulation) confirms that accord-building is how the 30-30-30 split is executed in practice: each tier of the formula is typically an accord, not a single note.

TAKEAWAY
If a perfume's note list includes amber, musk, leather, tobacco, or incense — these are accords, not ingredients. No single raw material produces these impressions alone. A perfumer who says they are "adding amber" means they are adding a pre-constructed amber accord or building one within the formula. Understanding this changes how you read any note list. "Amber" is a result. The ingredients are behind it.