説明書

Treasure. 宝物 is a prized possession; 国宝 is a National Treasure.

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

Half of 瑠璃, the deep blue stone. On its own it is used mostly for its sound and its colour.

The capital, and any big city. 東京都 is the Tokyo Metropolis; 都合 is how your circumstances stand.