to be willing to do sth; to be ready to do sth; to be happy to do sth;
乐 · 5 strokes
Pictograph of an ancient wooden stringed musical instrument. The simplified character 乐 was adapted from the cursive form of the traditional character 樂.
意 · 13 strokes
Thought (意) is the sound (音) that comes from the mind (心). (Oversimplified for brevity. The 音 component in this character has a complicated history.)