Create an image that captures an ethereal birthday celebration taking place on a grand theater stage, all under the illuminating glow of a spectral spotlight. The backdrop iridescent and morphing into fantastical architectures, drawing inspiration from renowned theatre shows, their scenes ebbing and flowing into each other. Dominating the center stage is a whimsical cake, specifically crafted in the motif of a theater marquee with the words 'Happy Birthday' glowing in bright neon hues, each letter theatrically dancing. Figures, adorning masks reflective of Greek Chorus, clutch onto musical instruments and prepare themselves to serve up a festive overture that engulfs the entire venue, epitomizing the spirit of musical theater into every detail and nuance of the birthday celebration.

Generated with these themes: Musical theatre, and Theatre sign.

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