Cavaquinho is a samba written in the early 1920's by the famous Brazilian composer, Ernesto Nazareth.  This arrangement was adapted for accordion from the original piano score by outstanding composer and arranger, Gary Dahl.  This piece has also been know by other names such as "Brazilian Ukulele".  Try the first theme as shown...and the other two themes will be just as exciting to play.  There is no need for exercise books....since this piece can double as an exercise study, but certainly with a lot more enjoyment!