Illustrate a T-shirt design that embodies the spirit of pop culture through a vibrant digital artwork. The design should prominently feature a pair of sneakers and a set of headphones, creatively intertwined to symbolize the connection between sports and music. Use a lively color scheme with bright pinks, greens, and blues to create a visually striking effect. The background should be abstract, with splashes of color that enhance the overall vibrancy without distracting from the main symbols. Consider adding a fun tagline like "Step to the Rhythm" in a bold, modern font, placed strategically to balance the composition and draw attention to the design.