Portrait of Early Music Competence
lIn infancy, normal children sing, babble, produce undulating patterns, and imitate tones sung by others. 
lAn important transition in their musical lives occurs in the middle of the second year of life when them begin to emit tones that explore small intervals from seconds to fourths. 
lThey begin to invent spontaneous songs and imitate short patterns from familiar songs. 
lBy age three or four, the original tunes and exploratory sound play give way to conformity as they begin to limit themselves to the songs of the dominant culture. 
lBy school age, children know what a song should be according to the cultural practice.  They can produce a fairly accurate rendition of common melodies.  
Gardner, 1983