Ballad

Based on the definitions provided, here are the correct matches for each poetic form:

1. **Alliteration**: "The repetition of initial consonant sounds in a series of words within a line or stanza."

2. **Ballad**: "A narrative poem often meant to be sung, typically with alternating rhyme and regular meter."

3. **Epigram**: "A short, witty poem that makes a clever or ironic point."

4. **Sonnet**: "A 14-line poem with a specific rhyme scheme and meter."

If you need any more information or clarification on these poetic forms, feel free to ask!