Top, middle and base notes constitute what is known as the olfactory pyramid. They are the three groups of notes that complete a formula to give balance to a fragrance, from fresh and fleeting to deep and long-lasting.Oud Al Anbar has Oud top note, sweet as middle note and wood as base note .The perfect blend of these notes mesmerizes you with its exhilarating fragrance. Top, Middle and Base notes are also the main reason why a fragrance changes over time, from its first to lasting impression.