For additional information on the
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participants’ musical environment, supplementary data were obtained from
around 1000 parents. The basis of his research consisted of participants’
vocal and behavioural responses to sound – sound varying from domestic
sounds to singing, rhythms and music (Moog, 1968:8-10). Moog identified
these responses by (unstructured) observations, which eventually form the
foundation for his theory of musical development (Moog, 1968). In theintroduction of his publication on this research, Moog argues that: