\version "2.7.29"
#(set-default-paper-size "letter")
\paper { #(set-paper-size "letter")
betweensystempadding = #1
raggedbottom=##f
raggedlastbottom=##f  }
\header { 
title = "Concerto for Bassoon and Orchestra in B-flat major"
opus = "K. 191" 
instrument = "Viola"
composer = \markup \center-align { "Wolfgang Amadeus Mozart" \small "(1756-1791)" }  } 
\include "viola1.ly"
\include "viola2.ly"
\include "viola3.ly"

\book {
\score {   \violaa  }
\score {   \violab  }
\score {   \violac  } 
}