OK, now I'm up on my soap box... 
From an engineering standpoint, the MP3G formats (I believe there are several versions) have absolutely NO SIMILARITIES to the internationally accepted, ISO standards CD+G format. MP3G is a very simplistic format developed quickly for public distribution.
In most MP3G files, both the music and the lyrics are copyrighted. This is true unless both the producer and song writer put their work in public domain.
If you made your living from composing music or writing lyrics, would you put your work in public distribution without any income? Neither do other professionals. The only exception is if someone wanted to "introduce" their work to the world as a free demo.
I have never heard of a professional doing this.
Thus,
to my knowledge, MP3G songs are illegally created and distributed. If you want to create an MP3G song in your own house, and play it only in your house, you can legally do this. You will not find professional, commercial sites distributing them. If they did, they could be sued as Napster was.
If you legally obtain an MP3 file, your use of it is legal. If not, you are ripping off the original artist and recording company who created and mastered the song. In all cases, buying the Audio CD and importing tracks as .wav files is superior, because MP3 compression removes some of the master file contents. For example, using our Vogone (or any other vocal removal program) to process an MP3 file converted .wav file will not do as well as processing the original .wav equivalent from a CD.
There are programs that can convert an MP3 song into a WAV file. With Karaoke Home Producer, you can then add lyrics in sync to the .wav file and export it as a CDG file. You can then use our Microstudio program and a CDG capable CDR drive to write it with other CDG songs to a CDG disc to play in your wife's Karaoke player.
The CDG format is the mainstay for Karaoke around the world. All of MTU's software tools work with it. MTU is not contemplating supporting any of the MP3G formats (I'm the Pres so what I say goes...
). If everyone in the world converted to this format, there will be no more Karaoke CDG players, hosted shows (public shows must be legal, or the FBI confiscates all equipment, computers, discs and songs), and no more Karaoke production companies.
I for one, do not like that alternative. IMHO... MP3G is a very nasty concept.
