Moog’s research seems to have influenced Swanwick & Tillmans’ spiral of
musical development, as his findings and terminology such as ‘sensory’ and
‘manipulative’, can be recognized in the first two phases. (Swanwick, 1988).
Swanwick and Tillman’s spiral model indicates a concentric course of
development. Concentric means that by the reach of every new spiral phase,
repetition of previous acquired knowledge and skills takes place, resulting in
deepening and broadening of this knowledge. In this model, by the
descriptions of these circular phases, childrens’ musical behaviour from the
age of 4 - 7 is well documented and seems representative for the age group,
and might be helpful in explaining future observed behaviour.