\usefonttheme{serif}

\setbeamerfont{author}{family=\rmfamily}
\setbeamerfont{footline}{shape=\scshape,family=\rmfamily}
\setbeamerfont{title}{size=\large,shape=\itshape}
\setbeamerfont{subtitle}{size=\normalsize}

\setbeamerfont{block body}{shape=\upshape}
\setbeamerfont{block title}{size={},shape=\upshape,series=\bfseries}

% Use slightly more leading than normal.
\linespread{1.1}

% The references can be tiny.
\setbeamerfont{bibliography item}{size=\footnotesize}
\setbeamerfont{bibliography entry author}{size=\footnotesize}
\setbeamerfont{bibliography entry title}{size=\footnotesize}
\setbeamerfont{bibliography entry location}{size=\footnotesize}
\setbeamerfont{bibliography entry note}{size=\footnotesize}