头韵法（Alliteration）是西方诗歌里的一种押韵形式，它是说一行韵文或一首诗的好几个词的头一个字母辅音不断重复，这样形成了一个韵律。像一个有名的英语绕口令（头韵是字母p）：

Peter Piper picked a pek of pickled peppers,A peck of pickled peppers Peter Piper picked.If Peter Piper picked a peck of pickled peppers,How many pickled peppers did Peter Piper pick?

But if Peter Piper picked a peck of pickled peppers,Were they pickled when he picked them from the vine?Or was Peter Piper pickled when he picked the pickled peppersPeppers picked from the pickled pepper vine?