Marimba players from all over the world are in the Twin Cities for the Marimba 2010 International Festival and Conference. Some of the music comes local composers. In the first of two Eggs related to the festival, 3-Minute Egg brings you to the Cathedral of St. Paul to hear marimba music paired with the Vocalessence choir in a new piece composed by St. Paul’s Stephen Paulus. The public performance is 8 pm today at the cathedral. On Monday, we’ll bring you to the Southern Theater to hear So Percussion perform new work by Minneapolis composer Mary Ellen Childs.