Table: music_release_4
Columns: region
date
format
label
edition

Question: Which label released on February 18, 2009?
SQL: SELECT "label" FROM music_release_4 WHERE "date" = 'february 18, 2009'

Question: When did Avex Entertainment release a CD?
SQL: SELECT "date" FROM music_release_4 WHERE "format" = 'cd' AND "label" = 'avex entertainment'

Question: When did Hollywood Records release a digital download?
SQL: SELECT "date" FROM music_release_4 WHERE "label" = 'hollywood records' AND "format" = 'digital download'

Question: What kind of edition was released September 23, 2008 from the United States?
SQL: SELECT "edition" FROM music_release_4 WHERE "date" = 'september 23, 2008' AND "region" = 'united states'

Question: What format was released April 16, 2009?
SQL: SELECT "format" FROM music_release_4 WHERE "date" = 'april 16, 2009'