This is a vibrant, digital illustration in a neon-lit, retro-futuristic style. The central subject is a cube composed of two stacked, glowing cubes, each with a heart and musical note theme. The top cube displays a heart symbol in neon pink, pulsating with a heartbeat rhythm, surrounded by a border of neon blue lines. The bottom cube features a heart symbol in neon green, also pulsating, with a similar border. Both cubes have a grid pattern and are outlined in neon blue, giving them a holographic appearance.