From i.Tech Tecnologia da Informacao:
GoSing is a full featured karaoke player. Compatible with the KAR, MID and MK1 file formats, the program can also open directly standard ZIP compressed files containing karaoke music without need any external helper application. You can change the KEY, TEMPO and several other features via our exclusive ERK system (Easy to Remember Keystrokes). Also exclusive is the 'wait the trafic light' system that shows you the exact moment to start to sing each phrase. Several installation options can be instantaneously configured from it's control menu.