Can AI automatically generate background music for a video without any prompting?

Yes — an agentic workflow can score your video without a music prompt. In one documented production, the invideo agent proactively generated three music score options during video generation, with no request from the creator, and delivered a finished score alongside 26 video clips. Seedance 2.0 also generates native audio directly with each clip.

You don't need to write a music brief for AI to score your video — you need a system that already holds your project's context. invideo is an agentic video creation tool, and because the invideo agent holds your script, characters, and tone in persistent context, it can infer what the soundtrack should be instead of waiting for a prompt. In one documented production of a 45-second cinematic heist scene, the invideo agent generated three music score samples on its own initiative while video generation was still running, and included one finished music score in the final downloadable folder alongside 26 video clips and 4 text cards. The creator never asked for music — the invideo agent ran it as a parallel task.

The second unprompted audio layer comes from the video model itself. Seedance 2.0 generates native diegetic audio with each clip — in one short film, the creator manually added only a single sound effect (heels clicking in a kitchen) across the entire project; every other sound was generated natively inside the model with no audio prompting. Where model choice matters, the invideo agent routes music generation to a dedicated music model (Google Lyra 3 Pro runs inside invideo for scoring) and video-with-audio generation to Seedance 2.0 — all of these models are available inside invideo, so you don't assemble a separate audio toolchain.

"Without any prompting" has one practical nuance: the AI composes unprompted, but you still choose. The documented pattern is options-based — the invideo agent returns multiple score samples and you select the one that fits, the same way voice casting works in these productions (generate multiple samples, pick one). That selection step is where your taste enters; the composition step is fully automatic.

To make the unprompted score actually match your video, front-load context rather than writing a music prompt: give the invideo agent your script or scene description before generation, since the score it proposes is derived from the narrative and mood it holds in context. If none of the proposed samples fit, a one-line correction ("slower, more tension, no percussion") redirects the next batch — still far short of authoring a music brief.

Watch some of these to see what works for you:

The magic moments are when Agent One does the step you didn't ask for.

— a filmmaker documenting a production made with the invideo agent