From the recording Diálogos Duo/Choro Tributes

"Sun Choro" is dedicated to the cavaquinho virtuoso Waldir Azevedo (1923-80), who was the first to elevate the tiny steel-string ukelele to a soloistic prominence and popularity. This choro is a bit less syncopated than the others in the suite, connoting Azevedo's penchant for composing pieces that were technically challenging. The traditional form is modified to ABACA, where each thematic section is 32 bars through-composed rather than repeated 16-bar sections. The tonal scheme is the famlliar I-VI-IV (or Gma-Emi-Fma).