You must always spell titles correctly, otherwise the stores will not accept the release. Avoid continuous upper case (ALLCAPS) and continuous lower case. Use the correct spelling and grammar of the title language in all titles except English ones, where the first letter of each word must be capitalized.
In one-track releases, the release title must be the same as the track title. Mix and song version must be entered under "Title Version".
Examples of permitted title versions: Instrumental, Bueno Remix, Radio Edit, Piano Version, etc.