Loudmouth

The Crescendo, also translated as "Loudmouth" in Kingdom Hearts 358/2 Days, is an Emblem Heartless that is found in Kingdom Hearts: Chain of Memories, Kingdom Hearts II, and Kingdom Hearts 358/2 Days.

Attacks
These Heartless can be both a pain and a gain. They have little strength, but their sounds can call in reinforcements. Their sounds can also heal nearby Heartless, but by using the Reaction Command, Heal Stomp, the Crescendo's healing sounds are directed towards Sora and friends instead.
 * Healing Trumpet: Heal Heartless' HP
 * Trumpet Strike: Pounce and trumpet swing
 * Trumpet Summon: Summon Heartless

Design
Based on the design of an old-fashioned vehicle horn, the round, black body of the Crescendo resembles a squeeze bulb, while it's golden mouth resembles the bell of an instrumental horn. The Heartless's black head and antenna resembles a musical note, notably a quaver or an eighth note. A red collar separates the head and body. Two yellow eyes can be seen on it's face, and it seems to be wearing earmuffs on it's head, which are light and dark blue in color. The Heartless emblem can be seen clearly on the front of it's body.

The colors of the Crescendo become brighter in Kingdom Hearts II Final Mix. It's body and head are now blue, the mouth-bell is now red, the collar is now a light blue, and the earmuffs are yellow and orange in color.

The Crescendo resembles a creature featured in the 1951 film, Alice in Wonderland. This creature resembled a duck, with a golden horn bell for a bill, and a purple squeeze bulb for a body.

Musically, a crescendo is a gradual increase in volume.

Trivia

 * The Crescendo, as well as the Creeper Plant and Tornado Step, are the only Heartless that were introduced in Kingdom Hearts: Chain of Memories.