CREATE TABLE table_15678 ("Artist" TEXT, "Country of origin" TEXT, "Period active" TEXT, "Release-year of first charted record" FLOAT, "Genre" TEXT, "Claimed sales" TEXT)

What was the active period for the pop genre?
SELECT "Period active" FROM table_15678 WHERE "Genre" = 'pop'
SELECT "Period active" FROM "table_15678" WHERE "Genre" = 'pop'