説明書

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

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

The 陽 of 陰陽 — the bright half, the warm half, the side facing the sun. 太陽 is the sun itself.

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