The Score Header is where all the global variables relative to the score information or to the output sound are defined. Concepts such as Tempo, Beat, Output Sound File or Sample Rate must be included in this part or either will be assumed as default.
Another feature included in the Header is the definition of all the Instruments to be used in the score. A reference to the Instrument File location must therefore be included.
And last, all kind of user variables can be initialized in this part of the Score. The user can define an unlimited set of variables in order to access the Instruments, Generators or even groups of Instruments. Note that if more than one Instrument of the same kind is to be used, its Definition File will only be loaded once and can then be referenced by the use of user defined variables such as piano1, piano2...