CREATE TABLE table_13056 ("Year" FLOAT, "Song" TEXT, "Film" TEXT, "Co-Singer" TEXT, "Composer" TEXT, "Lyricist" TEXT)

What co-singer has sukhwinder singh as the composer?
SELECT "Co-Singer" FROM table_13056 WHERE "Composer" = 'sukhwinder singh'
SELECT "Co-Singer" FROM "table_13056" WHERE "Composer" = 'sukhwinder singh'