So I made a video and while I was putting the last song in it, I clicked the song in the files and the program freezed but the rest of the laptop works, I don't know what to do, I didn't save it and I can't do it all again
If you've enabled autosave (Preferences->General->enable autosave), then restart the program and you'll have back all that you have done (except, maybe, the last action).