Sentence case formatting involves capitalizing the first word, first word of a subtitle, and all proper nouns.
For Spanish or Portuguese titles, you can decide on either title case formatting or sentence case formatting, as long as the casing is consistent throughout a given album.
Sentence case formatting can never be used for English language album titles or track titles.
Common language locales that must be in sentence-case format are Swedish, French, Italian, Scandinavian, and Eastern European Languages.