Wild bird food.

My birds are spoiled. I feed them kibbled peanuts, berry suet pellets, peanut suet pellets, sunflower hearts, sultanas and mealworms.  
The most popular are the sunflower hearts and the mealworms. A lot of places sell bags of wild bird seed that I find the birds won't eat except the pigeons.  Those mixes are mostly corn (wheat). If you are going to buy a feeder fill it with sunflower hearts. This will attract a lot of the smaller more decorative birds, like blue tits and gold finches.