There are two adult plumage variations of the White-throated Sparrow known as the tan-striped and white-striped forms. On the white-striped form the crown is black with a white central stripe. On the tan form, the crown is dark brown with a tan central stripe. Both variations feature dark eyes, a white throat, yellow lores and gray bill.  It’s the yellow lores we look for to help us know it’s a White-throated Sparrow and not a Song Sparrow.
The other thing that helps with identification is that White-throated Sparrows are only here in the Winter months.  They stay year round in the Atlantic provinces of Canada. In winter, they migrate to the southern and eastern United States. 
References and Additional Information
 Wikipedia: White-throated Sparrow
 The Sibley Guide to Birds, second edition – David Allen Sibley
 Cornell – All About Birds: White-throated Sparrow
 Cornell – All About Birds: White-throated Sparrow – sound
 The Breeding Bird Atlas of Georgia – UGA Press: Schneider, Beaton, Keyes and Klaus, Eds.
 Cornell – All About Birds: White-throated Sparrow – life history