As a small follow-up to my contribution last week on string music from Pernambuco related with choro, I highly recommend you to listen to the shown cd, as the music contained is a splendid example of the Pernambucano mixture of different musical traditions. As the title of the cd reads, the music is influenced by both choro and frevo. Like choro, frevo is closely related to the samba, and has grown and adapted into a more modern sound. Musically the frêvo is in the form of a march but is distinguished by its characteristic fast syncopation played in a very fast, binary tempo. Frevo is most popular in Pernambuco state, especially in Recife.
To illustrate frevo I found a couple of performances at YouTube inserted below. The first is a fragment of a live-performance by Armandinho and his trio playing 'Duda no frevo'
The last video performance here demonstrates the tight connection between frevo and modern jazz guitar playing. Fred Andrade & Rodolfo Rocha playing 'Lágrima de Folião'