For Better for Verse: An interactive learning tool that can help you understand what makes metered poetry in English tick.

Link to U.Va. English Department
When you learn to scan, you are learning something that major poets from the 14th into the 20th century learned before you.  To some extent they learned it by analogy to the classical Latin and Greek versification drilled into them at school; in every wider and finer sense, however, they learned it by osmosis, through a process of total immersion in poetry they loved.  The poets absorbed their English metrics right off the page, the way a tap dancer picks up a lick on a street corner or a fiddler fingers a riff at a harvest supper.  Because, being poets, they had an extraordinary ear for word music, they learned its unwritten rules fast;  having mastered them, they took the art in new directions that blazed trails in literary history. Practicing scansion won’t make you a poet.  What it will do, though, if you’ll let it, is transform your approach to the reading of poems.  There is simply no better way for readers to get an inside line on what versecraft is about.  While our topic here is, nearly exclusively, the interplay of rhythm with meter, listening hard for that will tone up your attention to other aspects of the soundtrack poetry rides on too.