\bookpart {
  \paper {
    oddHeaderMarkup = \markup {
      \column {
        \fill-line {
          \smallCaps \fromproperty #'header:instrument
        }
        " "
      }
    }
    evenHeaderMarkup = \oddHeaderMarkup
  }
  \score {
      \new StaffGroup \keepWithTag #'vnp \Imusic
      \layout {
        \compressFullBarRests
        \context {
          \Score
          \override MultiMeasureRest.expand-limit = #2
        }
        \context { 
          \Staff \override InstrumentName #'stencil = ##f
        }
      }
      \header {
        instrument = "Violin I"
      }
    }
  }
  \bookpart {
}