Songbook: Wiederkehrende Akkorde erkennen und einfügen

\documentclass{article}
\usepackage{songs}

\begin{document}

\begin{songs}{}
\beginsong{Viva La Vida}[by=Coldplay]

\capo{I}

\beginverse\noversenumbers
  \nolyrics Intro: \[C] \[D] \[G] \[Em] ($\times2$)
\endverse
\setcounter{versenum}{1}

\beginverse\memorize
  \[Em]I used to \[C]rule the \[D]world
  Seas would \[G]rise when I gave the \[Em]word
  Now in the morning I \[C]sleep al\[D]one
  Sweep the \[G]streets I used to \[Em]own
\endverse

\beginverse
  ^I used to ^roll the ^dice
  Feel the ^fear in my enemy's ^eyes
  Listen as the ^crowd would ^sing:
  ``Now the ^old king is dead! ^Long live the king!''
\endverse

\beginverse
  ^One minute I ^held the ^key
  Next the ^walls were ^closed on me
  And I discovered that my ^castles ^stand
  Upon ^pillars of salt and ^pillars of sand
\endverse
\endsong
\end{songs}

\end{document}

\documentclass[12pt]{book}
\usepackage[chordbk]{songbook}                %% Words & Chords edition.

%%
% C.C.L.I. license number definition; for copyright licensing info.
%%
\newcommand{\CCLInumber}{\#999999}
\newcommand{\CCLIed}{(CCLI \CCLInumber)}
\newcommand{\NotCCLIed}{}
\newcommand{\PGranted}{}
\newcommand{\PPending}{(Permission Pending)}

%%
% Turn on index and table of contents.
%%
\makeTitleIndex         %% Title and First Line Index.
\makeTitleContents      %% Table of Contents.
\makeKeyIndex           %% Song Key Index.
\makeArtistIndex        %% Index by Artist.

\begin{document}
%%
% Songbook begins.
%%
\begin{song}{What A Mighty God We Serve}{C}
  {\SBPubDom}
  {\SBUnknownTag}
  {Isaiah 9:6}
  {\NotCCLIed}

  \SBRef{Give Thanks}{Hosanna! Music Tape HM-7}
  \SBRef{Hosanna! Music Book~I}{\#93}

  \begin{SBOpGroup}
    \Ch{C}{What} a mighty God we serve,

    What a mighty God we \Ch{G7}{serve},

    \Ch{C}{An}gels bow before Him,

    \Ch{C}{Hea}ven and earth adore Him,

    \Ch{C}{What} a mighty \Ch{G7}{God} we \Ch{C}{serve!}\Ch{[}{}\Ch{F}{}
      \Ch{C}{}\Ch{]}{}
  \end{SBOpGroup}

  \begin{SBVerse}
    O \Ch{C}{Zion,} O \Ch{F}{Zion,} that \Ch{G7}{bring}est good \Ch{C}{tid}ings,

    Get thee \Ch{F}{up} into the \Ch{G7}{High} Moun\Ch{C}{tains}

    Je\Ch{C}{ru}salem, Je\Ch{F}{ru}salem, that \Ch{G7}{bring}est good \Ch{C}{tid}ings

    Lift up thy \Ch{F}{voice} with \Ch{G7}{all} thy \Ch{C}{strength}

    Lift it \Ch{F}{up,} be not afraid;

    Lift it \Ch{C}{up,} be not afraid

    Say \Ch{Am}{unto} the \Ch{C}{ci}ties of \Ch{G7}{Judah,}

    ``Behold your \Ch{C}{God,}\Ch{C7}{} Behold your \Ch{F}{God,}

    Be\Ch{C}{hold} \Ch{G7}{your} \Ch{C}{God!''}
  \end{SBVerse}

\CBPageBrk
  \begin{SBExtraKeys}{%
    \STitle{What A Mighty God We Serve}{D}

    \begin{SBOpGroup}
      \Ch{D}{What} a mighty God we serve,

      What a mighty God we \Ch{A7}{serve},

      \Ch{D}{An}gels bow before Him,

      \Ch{D}{Hea}ven and earth adore Him,

      \Ch{D}{What} a mighty \Ch{A7}{God} we \Ch{D}{serve!}\Ch{[}{}\Ch{G}{}
        \Ch{D}{}\Ch{]}{}
    \end{SBOpGroup}

    \begin{SBVerse}
      O \Ch{D}{Zion,} O \Ch{G}{Zion,} that \Ch{A7}{bring}est good \Ch{D}{tid}ings,

      Get thee \Ch{G}{up} to into the \Ch{A7}{High} Moun\Ch{D}{tains}

      Je\Ch{D}{ru}salem, Je\Ch{G}{ru}salem, that \Ch{A7}{bring}est good
        \Ch{D}{tid}ings

      Lift up thy \Ch{G}{voice} with \Ch{A7}{all} thy \Ch{D}{strength}

      Lift it \Ch{G}{up} be not afraid,

      Lift it \Ch{D}{up} be not afraid

      Say \Ch{Bm}{unto} the \Ch{D}{ci}ties of \Ch{A7}{Judah,}

      ``Behold your \Ch{D}{God,}\Ch{D7}{} Behold your \Ch{G}{God,}

      Be\Ch{D}{hold} \Ch{A7}{your} \Ch{D}{God!''}
    \end{SBVerse}
  }\end{SBExtraKeys}
\end{song}
\end{document}