\documentclass{article}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage[a4paper,top=2cm,bottom=3.2cm,left=1.25cm,right=1.25cm]{geometry}

\author{Eric Teunis de Boone}
\title{Tinwhistle Tunes}

\begin{document}
\maketitle
\hrule

\tableofcontents
\hrule

\cleardoublepage
\addcontentsline{toc}{section}{Polkas}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{John Ryan's Polka}
\lilypondfile[noindent]{./polkas/john_ryans_polka.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Ballydesmond Polks (1)}
\lilypondfile[noindent]{./polkas/the_ballydesmond_polka_1.ly}
\end{minipage}

\cleardoublepage
\addcontentsline{toc}{section}{6/8 Marches}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{PM Donald McLean of Lewis}
\lilypondfile[noindent]{./6-8_marches/pipe_major_donald_mclean_of_lewis.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Pibroch o'Donald Dubh}
\lilypondfile[noindent]{./6-8_marches/pibroch_o_donald_dubh.ly}
\end{minipage}

\cleardoublepage
\addcontentsline{toc}{section}{Airs}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Sally Gardens}
\lilypondfile[noindent]{./airs/sally_gardens.ly}
\end{minipage}

\cleardoublepage
\addcontentsline{toc}{section}{Jigs}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Gander in the Pratie Hole}
\lilypondfile[noindent]{./jigs/gander_in_the_pratie_hole.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Saddle the Pony}
\lilypondfile[noindent]{./jigs/saddle_the_pony.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Donnybrook Fair}
\lilypondfile[noindent]{./jigs/donnybrook_fair.ly}
\end{minipage}

\cleardoublepage
\addcontentsline{toc}{section}{Hornpipes}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Greencastle Hornpipe}
\lilypondfile[noindent]{./hornpipes/the_greencastle_hornpipe.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Alexander's Hornpipe}
\lilypondfile[noindent]{./hornpipes/alexanders_hornpipe.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Harvest Home}
\lilypondfile[noindent]{./hornpipes/the_harvest_home.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Honeysuckle}
\lilypondfile[noindent]{./hornpipes/the_honeysuckle.ly}
\end{minipage}

\cleardoublepage
\addcontentsline{toc}{section}{Reels}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Bag of Spuds}
\lilypondfile[noindent]{./reels/the_bag_of_spuds.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Sunny Banks}
\lilypondfile[noindent]{./reels/the_sunny_banks.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Rolling on the Rye Grass}
\lilypondfile[noindent]{./reels/rolling_on_the_rye_grass.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Blacksmith}
\lilypondfile[noindent]{./reels/the_blacksmith.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{The Wind that Shakes the Barley}
\lilypondfile[noindent]{./reels/the_wind_that_shakes_the_barley.ly}
\end{minipage}


\cleardoublepage
\addcontentsline{toc}{section}{Slides}
\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Danny Ab's Slide}
\lilypondfile[noindent]{./slides/danny_ab_s_slide.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Thugamar F\'ein an Samhradh Linn}
\lilypondfile[noindent]{./slides/thugamar_fein_an_samhradh_linn.ly}
\end{minipage}

\begin{minipage}{\columnwidth}
\addcontentsline{toc}{subsection}{Denis Murphy's Slide}
\lilypondfile[noindent]{./slides/denis_murphy_s_slide.ly}
\end{minipage}

\end{document}