CREATE TABLE table_7570 ("Volume:Issue" TEXT, "Issue Date ( s ) " TEXT, "Weeks on Top" FLOAT, "Song" TEXT, "Artist" TEXT)

What is Song, when Volume:Issue is 15:19-20?
SELECT "Song" FROM table_7570 WHERE "Volume:Issue" = '15:19-20'
SELECT "Song" FROM "table_7570" WHERE "Volume:Issue" = '15:19-20'