Did I waste my money?

[rperez]

The majority of track are like the example you gave:

SC2345-12.cdg

However, they usually have the artist name and song title as well
For example:

SC2345-12_Chevelle_-_The_Red.cdg

or sometimes flipped around:

SC2345-12_The_Red_-_Chevelle.cdg

And then there are some where I have my own custom made karaoke tracks:

John Doe - song.cdg