Or whether musical training was recent or long past. Or whether performance was solo vs ensemble. Or what level of performance was achieved (occasional vs reg

Or whether musical training was recent or long past. Or whether performance was solo vs ensemble. Or what level of performance was achieved (occasional vs regular, personal vs serious avocational vs professional). There are a great many musical variables that need normalization given only 148 subjects. Even the variable they chose -- musical memory -- wasn't quantified in any recognized way that allowed meaningful comparison among subjects. Being able to recall a sequence of notes and their durations in a single-line melody is only one aspect of musical memory. It's a bit like assessing one's memory of a dance routine by asking how many steps were taken.