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After I flush my toilet and when the water is filling up in the bowl it sounds like it is singing.
I thought I had this problem once and it turned out to be the Dixie Chicks on the radio!!
But seriously, the fill valve in the tank may need to be tweaked. It may not be opening all the way, or some sediment may be causing a blockage that need to be cleaned.
What kind of toilet is it? Remove the top of the tank and tell us if it had a ball float or a plastic float on a post. We can help you adjust it with a little more info.