You can buy Kuroshitsuji (Its titled "Black Butler") in places like Boarders or other major book selling companies.
Amazon has it.
Kuroshitsuji was created by Yana Toboso.
Kuroshitsuji was originally a manga.
In the first Kuroshitsuji Musical there are 7 songs. In the second Kuroshitsuji Musical there are 15 songs.
There is no main character from Kuroshitsuji named Claudia. There is only Claude Faustus, who is one of the main characters in Kuroshitsuji II.
Unanswerred questions about kuroshitsuji can be found at the link at the bottom.
Kuroshitsuji is its own show and Drocell is a character in the show.
No where, as of now. It will not be released in the US until April.
If they are a fan of Kuroshitsuji, I would recommend Hellsing.
As of now there are no plans for Kuroshitsuji Season 3 to be made.
it is unlikly that there will be a 3rd season off kuroshitsuji
Sebastian and Claude do battle in Kuroshitsuji II, a number of times.