This book contrasts variations in Spanish and Brazilian Portuguese pronunciation, using as a reference for discussion the mainstream careful speech of news anchors at the national level or the equivalent type of speech: a well-educated style that nonetheless sounds natural. Pursuing an innovative approach, the book uses this view of language as a cornerstone to describe and discuss other social and regional variants relative to that speaking register. It is aimed at speakers of Spanish interested in learning Portuguese and speakers of Portuguese who want to learn Spanish, as well as language specialists interested in bilingualism, heritage languages, in the teaching of typologically similar languages in contrast, and readers with interest in Phonetics and Phonology. The book employs a variety of innovative approaches, especially the reinterpretation of some of the traditional concept in Phonetics, and the use of speech prosodies and speech melodies, a user-friendly strategy to describe speech prosody in languages and speech melody in music through musical notation.