説明書

Celebration, of the formal kind. 慶事 is a happy occasion; 慶応 is an era name.

The only one. 唯一 is unique; 唯我独尊 is standing alone above all.

Sound, including music. 音楽 is music; 発音 is pronunciation.

Long life, and the celebration of it. The character on wedding envelopes and New Year food.