Like many of us throughout time, Beethoven worried about money. Once in a while he would come across a musical project that promised high return for a relatively low investment of time. We feature some of those projects in “Cash Cow” during our third weekend of concerts. The Piano Trio in B-flat Major, op. 11, and Beethoven’s folk song arrangements will be performed. Madison’s favorite soprano, the magnificent Emily Birsan, will join BDDS in performances of the folksongs as well as Three Irish Folksongs dramatically set by John Corigliano for flute and soprano. The program concludes with Beethoven’s Piano Trio in E-flat Major, op. 70, no. 2, one of the great works of Beethoven’s middle period. Again, Visual artist Lisa A. Frank will create an exquisite video installation behind the performers on stage.