This research examined characteristics of a select group of tonal patterns to identify features that may affect the initial acquisition of skill in sight-singing pitch. Second graders (N = 193) individually read and sang 25 tonal patterns on a sight-singing pretest, posttest, and retention test. Between the pre- and posttest, the students practiced 15 of the patterns during general music classes, with one new pattern introduced and all previously presented patterns reviewed each session. Ten patterns not included in the instruction were read and sung only during tests. No pattern practice occurred for 8 weeks between the posttest and retention test. Sight-singing performance was assessed for pitch accuracy and contour accuracy. Pattern difficulty indices and difficulty rankings were determined on the basis of the results. Specific pattern features are considered in relation to these data, with some characteristics affecting accuracy with pitch and contour differently. (Contains 1 table.)