SongBloom: Coherent Song Generation via Interleaved Autoregressive Sketching and Diffusion Refinement

TL;DR

SongBloom is a novel full-length song generation framework that combines autoregressive sketching with diffusion refinement to produce coherent, high-quality music with improved global structure and local fidelity.

Contribution

It introduces an interleaved autoregressive diffusion approach for scalable, coherent song generation, outperforming existing methods in quality and coherence.

Findings

Outperforms existing methods on subjective and objective metrics.

Achieves performance comparable to state-of-the-art commercial platforms.

Effectively balances global coherence with local fidelity in generated music.

Abstract

Generating music with coherent structure, harmonious instrumental and vocal elements remains a significant challenge in song generation. Existing language models and diffusion-based methods often struggle to balance global coherence with local fidelity, resulting in outputs that lack musicality or suffer from incoherent progression and mismatched lyrics. This paper introduces $\textbf{SongBloom}$, a novel framework for full-length song generation that leverages an interleaved paradigm of autoregressive sketching and diffusion-based refinement. SongBloom employs an autoregressive diffusion model that combines the high fidelity of diffusion models with the scalability of language models. Specifically, it gradually extends a musical sketch from short to long and refines the details from coarse to fine-grained. The interleaved generation paradigm effectively integrates prior semantic and acoustic context to guide the generation process. Experimental results demonstrate that SongBloom outperforms existing methods across both subjective and objective metrics and achieves performance comparable to the state-of-the-art commercial music generation platforms. Audio samples are available on our demo page: https://cypress-yang.github.io/SongBloom_demo. The code and model weights have been released on https://github.com/Cypress-Yang/SongBloom .