“…Although a voluminous literature exists describing the acoustic parameters on which species song recognition is based (Becker, 1982), less is known about the acoustic features underlying discrimination of within-species song variation (Brooks & Falls, 1975; Falls, 1982; King & West, 1983). It is clear from several studies that birds discriminate entire songs that typify different individuals or different geographic locales (e.g., Baker, Tomback, Thompson, Theimer, & Bradley, 1984; Becker, 1977; Harris & Lemon, 1972; 1976; Kroodsma, 1976; Kroodsma, Meservey, Whitlock, & VanderHaegen, 1984; Searcy, McArthur, Peters, & Marler, 1981). Recent playback experiments and developmental studies have circumstantially implicated syllable structure as a strong determinant of conspecific song recognition by song sparrows.…”