Tokens

Page number: {@page@}
Layout name (i.e. shown in the Layouts panel in Setup mode): {@layoutname@}
Player names: {@playernames@}
Player list: {@playerlist@}

Fields from the ‘Project-wide’ page of File > Project Info:
{@projecttitle@}
{@projectsubtitle@}
{@projectdedication@}
{@projectcomposer@}
{@projectarranger@}
{@projectlyricist@}
{@projectartist@}
{@projectcopyist@}
{@projectpublisher@}
{@projecteditor@}
{@projectcopyright@}
{@projectworknumber@}
{@projectcomposerdates@}
{@projectcompositionyear@}
{@projectotherinfo@}

Fields from the per-flow pages of File > Project Info (you get the value for the current flow at the start of the first music frame on the page on which the token is used):
{@flowtitle@}
{@flowsubtitle@}
{@flowdedication@}
{@flowcomposer@}
{@flowarranger@}
{@flowlyricist@}
{@flowartist@}
{@flowcopyist@}
{@flowpublisher@}
{@floweditor@}
{@flowcopyright@}
{@flowworknumber@}
{@flowcomposerdates@}
{@flowcompositionyear@}
{@flowotherinfo@}

Tokens can only be used in text frames, not in text items you create with Shift+X.