The Brown Thrasher has the largest repertoire of any North American species. Some birds may know as many as 2000 different songs. They may mimic the songs of other birds or other sounds they hear.

The song of the Brown Thrasher closely resembles that of the Northern Mockingbird. However, the thrasher tends to repeat each phrase only twice, while mockingbirds repeat each phrase several times, before moving to the next.