Libretto: Giving LLM Agents a Sense of Musical Structure

Libretto is a newly introduced framework designed for symbolic music generation and revision, utilizing an LLM-native grammar that incorporates explicit structural elements such as onset slots and bar-level organization. It evaluates generated music within a calibrated statistical space based on various musical dimensions, including rhythm, harmony, and texture, facilitating tasks like gap filling and reference-guided generation. This framework enhances the ability of LLM agents to produce and manipulate music in a structured, measurable manner, making it a valuable tool for practitioners focused on integrating AI with music composition and analysis.