What aspect did modern experimental music expand beyond traditional boundaries?

Modern experimental music significantly expanded the methods of production and performance of music, which is why this choice is the most fitting. While traditional music often adhered to established forms, instrumentation, and compositional techniques, experimental music explored new avenues that challenged the status quo.

This exploration includes the utilization of unconventional instruments, the integration of technology in music composition and production, and innovative performance practices. For instance, composers began to incorporate electronic sounds, field recordings, and non-musical elements into their pieces. Additionally, the performances often broke away from the conventional concert format, embracing site-specific locations and multimedia presentations that create a more immersive and interactive experience.

This expansion of methods represents a broader artistic vision that prioritizes creativity and exploration, aligning with movements like avant-garde art and musique concrète. By pushing these boundaries, modern experimental music invites audiences to reconceptualize their understanding of what music can be. This approach stands in stark contrast to the other choices, which focus on emotional expression, specific instruments, or adherence to genres that are more typical in traditional music compositions.