There are currently 9 known artists/groups with this name.

1: Turkmen rock band (Turkmenistan), playing both group's own creations as well as native and foreign popular music stuff (covers).

2: Japanese indie rock band.

3: Swedish "Dansband" group started 1990.
Their official site is http://www.blackjack.se (currently only in Swedish language)

4: Rapper from France.

5: Belgian hardrock cover band.

6: Italian rock band.
Their official site is currently http://www.myspace.com/blackjackmusicrock

7: Australian heavy metal band.

8.Thai singer (แบล็คแจ็ค).

9. Ukrainian rock band.
http://www.myspace.com/blackjackart
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