In Ondarroa Basque there is a lexical distinction between accented and
unaccented morphemes. Words containing accented morphemes receive wor
d-penultimate prominence. Other words are unaccented and, in medial po
sition, surface without prominence on any syllable. Phrase-finally, le
xically unaccented words receive phrase-penultimate prominence. Intere
stingly, certain empty Vowels are counted for the assignment of phrasa
l prominence to lexically unaccented words, but not for the placement
of lexical accents on the penultimate syllable of the word. This situa
tion is incompatible with the traditional concept of phonological deri
vation. On the other hand, the facts receive a straightforward account
in terms of constraints operating on surface patterns.