CREATE TABLE table_22558 ("Date" FLOAT, "Single" TEXT, "Backed with" TEXT, "Record label" TEXT, "Format" TEXT, "Other details" TEXT)

What single(s) released in 2008 and had 4000 copies?
SELECT "Single" FROM table_22558 WHERE "Date" = '2008' AND "Other details" = '4000 copies'
SELECT "Single" FROM "table_22558" WHERE "Date" = '2008' AND "Other details" = '4000 copies'