prologuize

Verb

 * 1)  To deliver or create a prologue, as for an oration or for a written or musical work.
 * 2) * c. 1808, The Edinburgh Review, review of Marmion by Sir Walter Scott, in John Louis Haney (ed.), Early Reviews of English Poets (1904):
 * The place of the prologuizing minstrel is but ill supplied, indeed, by the epistolary dissertations which are prefixed to each book of the present poem.