What does a reed's stability measure?

The stability of a reed primarily measures its ability to maintain consistent pitch across various dynamic levels. This means that a stable reed will allow the musician to play both softly and loudly without experiencing significant pitch alterations. A reliable reed will respond well to the player's breath support and embouchure adjustments, enabling the performer to achieve a steady tone regardless of volume changes. This characteristic is crucial for instrumentalists, especially those playing woodwind instruments, as it directly impacts performance quality and intonation.