\makeatletter

\newlength{\coverheight}
\setlength{\coverheight}{2cm}
\newlength{\coverspace}
\setlength{\coverspace}{0.1cm}
\newcommand{\songcover}{}
\newsongkey{cov}{\let\songcover\@empty}{\def\songcover{#1}}
\newcommand\cover{%
  \ifchorded%
    \ifx\songcover\@empty\else%
      \mbox{%
        \includegraphics[height=\coverheight]{\songcover}%
        \hspace{\coverspace}%
      }%
    \fi%
  \fi%
}

\iflyric%
  \renewcommand{\gtab}[2]{}%
\fi%

\newcommand{\image}[2]{%
  \ifchorded%
  \begin{flushright}%
    \includegraphics[width=#2cm]{#1}%
  \end{flushright}%
  \fi%
}

\makeatother