piece_IV = \relative do''
{
	\clef "treble"
	\time 4/4
	\key sib \major

	<re re,>1 \pp\fermata |
	R1*3 |
	r2 <fa, fa,>->\pp |
	R1*3 |
	r2 <fa fa,>-> |
	R1*3 |
	r2 <la la,>-> |
	R1*3 |
	r2 <la la,> |
	R1*3 |
	r2 <fa fa,> |
	R1*4 |

	%\mark \markup \box "A"
	\letterMark "A"
	r4\p re' r-. re-. |
	r4 dod-. r do-. |
	r4 sib-. r sib-. |
	r4 sib r sib |
	r4 re r re |
	r4 dod r do |
	r4 sib r sib |
	r4 sib r sib |

	r4 la r la |
	r4 sib! r la |
	r4 la r la |
	r4 sib! r la |
	r4 la r_\markup { "cresd poco a poco" } la |
	r4 sib r la |
	r4 la r la |
	r4 sib r la |

	r4\f re-. r re-. |
	r4 dod-. r do-. |
	\repeat "percent" 2 { r4 sib-. r sib-. } |
	r4 re-.\f r re-. |
	r4 dod-. r do-. |
	r4\< sib! r sib |
	r4 lab r sib | \letterMark "B"
	r4->\!\ff re r re-> |

	r4 dod-> r do-> |
	\repeat "percent" 2 { r4 sib-> r sib-> } |
	r4 re-> r re-> |
	r4 dod-> r do-> |
	\repeat "percent" 2 { r4 sib-> r sib-> } | \break
	\set countPercentRepeats = ##t 
		\repeat "percent" 8 { r4 re-> r re-> } | \letterMark "C"
	\unset countPercentRepeats 

	r4 re-. r re-. |
	r4 dod r do |
	\repeat "percent" 2 { r4 sib-. r sib-. } |
	r4 re r re |
	r4 dod r do |

	\repeat "percent" 2 { r4 sib r sib } | \letterMark "D"
	r4 mi r2 |
	r4 sib r2 |
	r4 sib r sib |
	r4\< la r sib\! |
	r4 reb-> r2 |
	r4 sib-> r2 |
	r4 sib-. r sib-. |
	r4 do-. r sib-. |

	r4 mi r2 |
	r4 mi r2 |
	r4\p mi\< mi mi |
	mi mi mi mi\! |
	R1*2 |
	r4 sib\fff r2\fermata \bar"|."
}