Well there's an error then It leaves..... Magix.... then I Forgot to save it.... that music is so long that I can't remake it
Hi, welcome to the Magix forums.
You've posted to the Off Topic forum but I suspect your question may relate to a specific Magix product. You need to tell us which one. Once you do this, I will move your post to the correct forum.
However, you also need to give us a lot more detail about your computer etc. https://www.magix.info/uk/forum/please-do-the-following-before-posting-your-question--621831/ gives you a lot more information about exactly what we need to know.
However, in answer to your specific question; if you failed to save your work at all and you do not have an Autosave feature enabled in the software, I fear your work may be permanently lost, sorry.
Jeff
Forum Moderator