(Mang, 2006) Mang summarised that echoing individual pitches or short melodic patterns provided by an auditory stumulus, and subjects usually were asked to vocally reprodece immediately. Sining a complete song was 'a more complicated process', as children need to manage all elements, such as the lyrics and rhythms. Thus Mang though that compared with replicating pitches or short melodic patterns, singing a complete song and pitch matching could show more singing skills and competency. However, singing patterns does not related to singing songs . In a longitudinal research from Welch et al., (1996; 1997; 1998), they reported that children's singing accuracy of pattern was significantly higher than that of songs. When chosing materials, Mang prefered to use a complete song, as she though singing songs was 'one of the central activities of the elementary school music curriculum, and that song performance can provide a much more musical expressive experience for children' (op cit. p 163). The author agreed with Mang, as singing a song could be efficicy to build a more completed competency of singing accuracy.