Childlike Jazz Beat Crayon Lesson

Create a cheerful children's crayon drawing on white paper in a 16:9 aspect ratio, aiming for an effect similar to keyframes in a hand-drawn jazz rhythm tutorial video. At the top, write the Chinese title in two lines of brightly colored crayon font:{argument name="headline text" default="Why does jazz music use 2 or 4 beats?"} Each character uses different bright colors such as purple, blue, red, green, yellow, and cyan, and the handwriting is slightly messy, as if it were written by a child. On the left side of the picture, there is a smiling cartoon child with a round head, black spiky hair, big round eyes, an open magenta mouth, arms happily raised, wearing a blue graffiti shirt, thin brown matchstick legs, and purple shoes. On the right side of the picture, there is a black grand piano outlined with rough crayon lines. The lid is open, revealing yellow graffiti strings inside, four legs, 7 white keys and 5 black keys, and 3 small yellow pedals below. The child reaches out to touch or play the piano, creating a lovely atmosphere for early music education. A striking subtitle is added near the bottom of the picture.{argument name="subtitle text" default="Let's confirm the meaning of keeping a beat."} Use bold white Chinese characters with a dark blue outline, and emphasize the first two characters in yellow. Employ a messy crayon texture, simple childlike proportions, imperfect perspective, bright primary colors, and numerous visible doodle strokes; keep the background pure white and avoid adding any extra objects.