CREATE TABLE table_7569 ("Volume:Issue" TEXT, "Issue Date ( s ) " TEXT, "Weeks on Top" FLOAT, "Song" TEXT, "Artist" TEXT)

What is Song, when Weeks on Top is 1, and when Volume:Issue is 15:6?
SELECT "Song" FROM table_7569 WHERE "Weeks on Top" = '1' AND "Volume:Issue" = '15:6'
SELECT "Song" FROM "table_7569" WHERE "Volume:Issue" = '15:6' AND "Weeks on Top" = '1'