The attacca action allows you to segue between two songs without stopping. Usually this happens at the end of a given song such that the music flows from the end of one song into the beginning of the next song. However it's possible to place attacca anywhere in a song and to segue into any song in the show. Place the attacca action at the point you wish to segue with the destination song as your target. The available choices will appear in a drop down list when you get to the target field. Leave the value field blank on attacca events.