Also if you want to typeset poems in footnotes, it is better to use tabular environment because firstly it gives no TeX capacity error and secondly footnote (which is the poem) is typeset better, without being centered. see attached.
test.tex
Description: TeX document
Description: Adobe PDF document-------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
