vanBasco will convert your PC into a full-featured karaoke, very simple and for free.
VanBasco supports Karaoke files (.kar) and other standard audio files like midi (.mid, .midi, .rmi).
The interface of VanBasco is fully customizable thanks to the high number of skins you can find all over internet. The lyrics can be shown in multiple formats: full screen, window, different backgrounds,...
You can change and recall tempo, volume, and key of a song, and mute or solo instruments.
Furthermore, vanBasco Karaoke supports a lot of plugins which will convert your karaoke sessions into an unbelievable experience.