\let\myTitle\title \renewcommand{\title}[1]{% \myTitle{% \fontsize{72}{72}\selectfont% #1 }% }
sorry, should be
\usepackage{setspace}
\let\myTitle\title
\renewcommand{\title}[1]{%
\myTitle{%
\setstretch{0.5}%
\fontsize{72}{72}\selectfont%
#1
}%
}Herbert
