SELECT "Song" FROM table_7569 WHERE "Weeks on Top" = '1' AND "Volume:Issue" = '15:6'
What is Song, when Weeks on Top is 1, and when Volume:Issue is 15:6?
CREATE TABLE table_7569 (
    "Volume:Issue" text,
    "Issue Date(s)" text,
    "Weeks on Top" real,
    "Song" text,
    "Artist" text
)