rather complex; bright and original; not aggressive; stylish; sphere of usage could be wide (canteen,café, restaurant, women shop, internet site etc.).
the most significant word ; it's red & written in bold with big letters; it attracts our attention and underlines the meaning of the whole sentence; it isn't sharp or rude; it sounds quite polite because of the word sorry.
the second important word after CLOSED. it is written in italics and is underlined to attract visitors and to make the bad news not so bad, to make it milder; it is some kind of apologizing; they try to make a dialogue with customers and to be friendly; SORRY express sincerity; probably it is closed due to some unexpected circumstances, that's why they apologize for it; this place will be closed for a long period of time, but this sign still gives a hope for a quick opening.
bad news; something negative; its very sad that they are closed.
sound is absolutely unnecessary. Everything is clear from words; sound is absolutely unnecessary. Everything is clear from words; the sound of Windows error; the sound of Windows error; It shouldnt be sharp and annoying, but friendly and neutral. It shouldnt be sharp and annoying, but friendly and neutral.