\description "Groups staves while adding a bracket on the left
side, grouping the staves together. The bar lines of the contained
staves are connected vertically. @code{StaffGroup} only consists of
a collection of staves, with a bracket in front and spanning bar lines."
\description "Groups staves while adding a bracket on the left
side, grouping the staves together. The bar lines of the contained
staves are connected vertically. @code{StaffGroup} only consists of
a collection of staves, with a bracket in front and spanning bar lines."