Aligning body matter across content formats

A content alignment service is described that may generate content synchronization information to facilitate the synchronous presentation of corresponding audio content and textual content. In some embodiments, portions of body text (as opposed to front matter, such as a table of contents; or back matter, such as an index) in the textual content are identified and synchronized with corresponding audio content. In one example application, an audiobook may be synchronized with an electronic book. As the body text portions of the electronic book are consumed, corresponding words of the audiobook may be audibly presented.