Loudmouth

The Crescendo is an enemy from Kingdom Hearts: Chain of Memories and Kingdom Hearts II.

Kingdom Hearts: Chain of Memories
A hopping, horn-like Heartless.

It's a bothersome foe that can honk and call other Heartless.

Kingdom Hearts II
''It restores the HP of surrounding enemies. Use Heal Stomp with the right timing to heal the party.''

When attacked, it may call for help, so be sure to defeat it immediately.

Card
See: Crescendo (Enemy Card)

Etymology
A crescendo is the gradual increase especially in the loudness of music or the peak of a gradual increase.

Trivia

 * In the GBA version of Chain of Memories, Crescendos only summon Soldiers. In the remake, Crescendos can summon other types of enemies (such as Darkballs) and play the same tune that they do in Kingdom Hearts II.