Aspen Song Select BlendAspen Song Select Blend Select Ingredients Sure To Attract Your Favorite Songbirds A High Energy Mix of Unique Ingredients Generous Percents of Sunflowers and Pistachios Attracts a Variety of Colorful Songbirds No Filler Seeds Whats the Right Bird Food to Use? Aspen Song Select Blend contains many of the favorite seeds of backyard songbirds. Black oil sunflower seeds have soft shells that allow easy access to their high energy kernels. Pistachios