# What is a music bed?

A music bed is music that plays underneath speech — low enough that the voice stays clearly on top, present enough that a silence never sounds empty. It is the sound of a produced podcast intro, a radio segment or an explainer, and the whole point is that you stop noticing it.

A bed is not a song. Songs have hooks, vocals and a build that pulls attention; a bed is steady, wordless and long enough to run under the entire segment without an obvious loop.

Cast generates the bed for the episode at the length you need — the Match button sizes it to your recording — and ducks it under the voice automatically, so it dips while someone talks and returns in the gaps. On a licensed plan the bed comes with a commercial license.

## Related

- [How do I generate music for my episode?](https://mubert.com/tools/cast/docs/generate-music)
- [Can the music be built to fit my episode automatically?](https://mubert.com/tools/cast/docs/match-voice)
- [What is ducking (or sidechain)?](https://mubert.com/tools/cast/docs/what-is-ducking)
- [Is the music licensed for commercial use?](https://mubert.com/tools/cast/docs/licensing)

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Source: https://mubert.com/tools/cast/docs/what-is-music-bed · Cast docs
Last updated: 2026-09-14