Mureka Instrumental

Mureka Instrumental is the sibling of Mureka Song, minus the singing. Same API, same credits, same output type - but the track comes back without vocals or lyrics, which makes it the node you'll likely reach for more often if you're making background music, video beds, or anything where a voice would get in the way.

Inputs and outputs

• instrumental (MUREKA_INSTRUMENTAL) - the text prompt describing the music, handed in from Mureka Text Prompt.
• model (COMBO, default auto) - let Mureka pick unless you have a preference.
• api_key (MUREKA_API_KEY) - from Mureka API Key.

The output is a single result (MUREKA_GENERATION_RESULT), the same package Mureka Song produces. From there it flows to Mureka Save to write the files, or Mureka Decode Audio if you want an AUDIO object to feed into other audio-aware nodes.

How it works

Same mechanism as Mureka Song: the node posts your prompt to the Mureka API and waits for the rendered track. The progress indicator you'll see is a courtesy spinner, not real progress - the README says so plainly, because the API doesn't expose generation progress. Don't mistake "it looks idle" for "it crashed."

Because generation is cloud-side, it runs identically on a potato or a 4090. That's the trade: no local music-model setup to fight, but every generation burns credits on your Mureka account - and instrumentals aren't cheaper than songs just because they're shorter. Check the pricing page before running a batch.

Installing

Same as the rest of the pack - ComfyUI Manager → Install Custom Nodes → search "Mureka API", or manually:

cd ComfyUI/custom_nodes
git clone https://github.com/leewinder/comfyui-mureka-api.git

No models to download, no GPU requirements. This is a small, single-maintainer pack by lee_winder (announced on r/comfyui in late 2025) and it's unaffiliated with Mureka itself.

Troubleshooting

• Result won't connect to your save node: both sides use MUREKA_GENERATION_RESULT, so if the wire won't attach you're probably on the wrong node, or on an old pack version - update and restart.
• Stuck-looking generation: it's the fake progress bar again. Verify the API key and your billing balance before assuming a hang.
• Instrumental ignores parts of your prompt: describe genre, mood, tempo and instrumentation explicitly. Music prompts reward being specific the way image prompts do.

If you only need one generation node for video work, this is the one. Songs are fun; instrumentals are useful.