Music cognition depends on the existence and deployment of processes for de
tecting, storing and organizing musical materials according to underlying s
tructural features. Common cultural experiences develop these processes to
a certain degree, but specifically designed and supported learning environm
ents are required to achieve the levels of expertise required to perform we
stern art music. Certain motivational and social factors are therefore impl
icated in the maintenance of activities that promote skill-acquisition, suc
h as practice. Expert musical performance is not just a matter of technical
motor skill, it also requires the ability to generate expressively differe
nt performances of the same piece of music according to the nature of inten
ded structural and emotional communication. This review examines these abil
ities and describes how some of them have been shown to have lawful relatio
nships to objective musical and extra-musical parameters. Psychological res
earch is thus engaged in a process of demystifying musical expertise, a pro
cess that helps to improve upon culturally prevalent. but ultimately non-ex
planatory, notions of inborn 'talent'.