Very often, what is wanted is not to typeset a large comprehensive score of several lines and pages, but an excerpt of one or two bars, preferably centered such as the various examples of this manual. This can be done simply by replacing normalshapemediumseriesnormalshapemediumseries\debutmorceau with normalshapemediumseriesnormalshapemediumseries\debutextrait2.26 and normalshapemediumseries\finmorceau or normalshapemediumseries\suspmorceau with normalshapemediumseriesnormalshapemediumseries\finextrait.
If you want to terminate it without a bar, you code normalshapemediumseriesnormalshapemediumseries\zfinextrait which acts like normalshapemediumseries\zsuspmorceau..