Some computer programs that serve a similar purpose to the standard karaoke machine have been developed that use MIDI instrumentation to record karaoke and also generate the accompaniment rather than a recorded track. This has the advantage of making transposition technically trivial and also shrinks the information needed to provide the accompaniment to the point where it is easy to transfer them across the Internet, even over slow connections.
Free country karaoke is about as popular as pizza and cute puppies these days. Since the days of Jimmie Rodgers and the Carter Family, country music has come a long way and transformed its sound.