If artist 1 is Wolfgang Gartner, what is the release date?
CREATE TABLE table_2921 (
    "Song 1 title" text,
    "Artist 1" text,
    "Song 2 title" text,
    "Artist 2" text,
    "Mix artist" text,
    "Guitar part?" text,
    "Mix pack" text,
    "Release date" text
)
SELECT "Release date" FROM table_2921 WHERE "Artist 1" = 'Wolfgang Gartner'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: If artist 1 is Wolfgang Gartner, what is the release date? ### Input: CREATE TABLE table_2921 (
    "Song 1 title" text,
    "Artist 1" text,
    "Song 2 title" text,
    "Artist 2" text,
    "Mix artist" text,
    "Guitar part?" text,
    "Mix pack" text,
    "Release date" text
) ### Response: SELECT "Release date" FROM table_2921 WHERE "Artist 1" = 'Wolfgang Gartner'