In the whimsical, cartoonish style of a birthday card, imagine a bustling, vibrant scene where the excitement of a birthday party meets the rhythm of K-pop, celebrating the youthful age of 13. At the center of the card, there's a lively open-air concert stage set in a playful park adorned with colorful streamers and twinkling fairy lights. The stage is designed to look like a miniature urban jungle gym, playfully incorporating elements like ladders and slides into the structure, reminiscent of Charles Schulz's simple yet engaging Peanuts backgrounds.

On the stage, a group of adorable, chibi-style cartoon characters represents the Stray Kids. Each character is dressed in exaggerated K-pop fashion with oversized sneakers, brightly colored jackets, and funky hats, taking cues from Walt Disney's ability to give characters distinct, memorable outfits. These characters hold various musical instruments: a shiny electric guitar, a sparkling microphone, and a set of vibrant drums, each detailed with small, playful animal stickers that pay homage to R. Crumb's quirky underground comix style.

In front of the stage, there's a cheerful crowd of anthropomorphic animals — think Gary Larson's The Far Side but with a touch of Bill Watterson's Calvin and Hobbes whimsy. There's a cool cat with sunglasses bopping to the music, a panda enthusiastically waving glow sticks, and a rabbit wearing a 'Happy 13th Birthday' party hat, all dancing on a lush green lawn scattered with colorful balloons and confetti. These details echo the bustling, detailed scenes of Winsor McCay's Little Nemo in Slumberland.

In the sky above, a flock of cartoonish music notes floats whimsically like clouds, reminiscent of the imaginative visuals of Osamu Tezuka's manga, subtly suggesting the melody and energy emanating from the stage. To the side, a birthday cake in the shape of a vinyl record sits on a picnic table, with "13" written in icing on top, a nod to the importance of the number and the musical theme. All these elements come together to form a joyful tableau, perfectly capturing the spirit of a musically-infused 13th birthday celebration.

Generated with these themes: Stray kids K pop, Music, 13, and Cute.

Made with ❤️ by AI.