Like [[simple ternary]] form, **compound ternary** form is divided into three principal sections, but one or more of them contains a nested mid-level form, such as a [[rounded binary]] or [[simple binary]] form. The minuet and trio is one of the most common compound ternary forms of the Classical period. Only the minuet (A) and the trio (B) were customarily written out; the return of the minuet was indicated by the marking *da capo*, and its repeats were generally omitted. $ \overbrace{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}\;\kern-1.258ex \overbrace{\text{b a}^{\prime}}^{\displaystyle\hphantom{\text{||}}\text{: B :||}}}^{\displaystyle\begin{matrix}\text{A}\\[-0.3ex]\text{(minuet)}\end{matrix}}\quad\overbrace{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}\;\kern-1.258ex \overbrace{\text{b a}^{\prime}}^{\displaystyle\hphantom{\text{||}}\text{: B :||}}}^{\displaystyle\begin{matrix}\text{B}\\[-0.3ex]\text{(trio)}\end{matrix}}\quad\overbrace{\kern2.8035ex\text{a}\kern2.8035ex\vphantom{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}}\;\kern-1.258ex \kern1.4985ex\text{b a}^{\prime}\kern1.4985ex\vphantom{\overbrace{\text{b a}^{\prime}}^{\displaystyle\hphantom{\text{||}}\text{: B :||}}}}^{\displaystyle\begin{matrix}\text{A}\\[-0.3ex]\text{(da capo)}\end{matrix}} $ Whereas the minuet is almost always a rounded binary, it is not uncommon for the trio to be a simple binary form. $ \overbrace{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}\;\kern-1.258ex \overbrace{\text{b a}^{\prime}}^{\displaystyle\hphantom{\text{||}}\text{: B :||}}}^{\displaystyle\begin{matrix}\text{A}\\[-0.3ex]\text{(minuet)}\end{matrix}}\quad\overbrace{\raise1.8em\hbox{$\displaystyle\text{||: A :||}$}\;\kern-1.258ex \raise1.8em\hbox{$\displaystyle\hphantom{\text{||}}\text{: B :||}$}\vphantom{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}}}^{\displaystyle\begin{matrix}\text{B}\\[-0.3ex]\text{(trio)}\end{matrix}}\quad\overbrace{\kern2.8035ex\text{a}\kern2.8035ex\vphantom{\overbrace{\text{a}\vphantom{\text{b a}^{\prime}}}^{\displaystyle\text{||: A :||}}}\;\kern-1.258ex \kern1.4985ex\text{b a}^{\prime}\kern1.4985ex\vphantom{\overbrace{\text{b a}^{\prime}}^{\displaystyle\hphantom{\text{||}}\text{: B :||}}}}^{\displaystyle\begin{matrix}\text{A}\\[-0.3ex]\text{(da capo)}\end{matrix}} $