The second to last piece in the Songbook Choro is Valsa Sem Nome von Vinicius de Moraes and Baden Powell. This choro is mostly played on the classical guitar, and it is a very popular guitar piece.
I have collected many great videos of this tune in my playlist below.
This is Valsa Sem Nome played by Baden Powell himself:
Baden Powell plays Valsa sem nome
And this is the same tune sung by Elizeth Cardoso:
Elizeth Cardoso – Valsa sem nome
Playlist Valsa Sem Nome
Wikipedia about Vinicius de Moraes: http://en.wikipedia.org/wiki/Vinicius_de_Moraes