WhistlePig Rye Whiskey. WhistlePig Double Malt Rye is our oldest Rye, patiently mellowed for 18 years. Its base of 79% Rye delivers bold, peppery spice, while 15% Malted Rye adds soft, floral and earthy character. A final 6% of malted barley brings rich, sweet, toasted notes.