Hi there! I understand you have a song stuck in generation mode on the Mureka app for 12 hours, and you'd like to delete it. Let’s get that sorted out.

First, to clarify: Are you trying to delete this stuck song from within the Mureka app on your iPhone, or are you looking to cancel the generation and remove it entirely from your project or queue? Also, have you tried to restart the app or your device since this happened? Sometimes that can help with stuck processes.

Meanwhile, here’s a step-by-step you can try to delete or clear out the stuck generation:

1. Force Close the Mureka App:
- On your iPhone (iOS 18.6.2), swipe up from the bottom of the screen and pause in the middle to bring up the app switcher.
- Locate the Mureka app and swipe it off the screen to close it completely.
- Reopen the app and check if the stuck song is still there.

2. Look for a Delete or Cancel Option:
- Within the Mureka app song list or project screen, tap and hold (long press) on the stuck song to see if any delete or cancel option appears.
- Some apps have a trash icon or swipe-to-delete gesture to remove items.

3. Check Your Account or Project Queue:
- If the song generation is queued or appears in your account’s generation queue, see if you can cancel or remove it there.

4. Reinstall the Mureka App:
- If the above doesn’t work, try uninstalling and reinstalling the app. This will clear cached data that might be holding onto the stuck generation.
- Be cautious if you have saved projects only on the app; back up if needed before uninstalling.

If after trying these steps the song remains stuck, it’s possible there’s a backend issue on Mureka’s side impacting generation processes long-term. In that case, I recommend contacting Mureka’s support directly for a server-side reset or manual removal of the stuck song.

Would you like me to guide you through any of these steps on your iPhone? Or do you have any more details about what you see on the screen right now? That will help me assist you better.