This article provides an overview of current and historically important 
issues in the study of the syntax-prosody interface, the point of 
interaction between syntactic structure and phrase-level phonology. We 
take a broad view of the syntax-prosody interface, surveying both direct 
and indirect reference theories, with a focus on evaluating the 
continuing prominent role of prosodic hierarchy theory in shaping our 
understanding of this area of linguistics. Specific topics discussed in 
more detail include the identification of prosodic domains, the 
universality of prosodic categories, the recent resurgence of interest 
in the role of recursion in prosodic structure, cross-linguistic 
variation in syntax-prosody mapping, prosodic influences on syntax and 
word order, and the influence of sentence processing in the planning and 
shaping of prosodic domains. We consider criticisms of prosodic 
hierarchy theory in particular, and provide an assessment of the future 
of prosodic hierarchy theory in work on the syntax-prosody interface.