\documentclass[12pt]{book}
\usepackage{libertine}
\usepackage{gregoriotex}

\raggedbottom

\begin{document}

\gabcsnippet{(c4) In(h) gr<sp>'ae</sp>(h)ci(h)a(h) hic(h) vé(h)ni(d)et.(d) (:) In(h) s<sp>'ae</sp>(h)cu(h)la(h) sæ(h)cu(h)ló(h)rum.(g) (::)}  

\end{document}
