1)   DART Karaoke Studio CD+G 1.4.9cdgp
Make and Play Karaoke on your computer. Rip & Burn CD+G Karaoke CDs. Suppress the Main Vocal from Stereo Recordings. Synchronize Lyrics with Music. Sing-Along and Record your Performance. Full Screen Playback Display.

 2)   MP3 Key shifter 2.0
MP3 Keyshifter is a breakthrough piece of software that allows you to change the key of any audio track and save the modified song as an MP3 or WAV file. If you use backing tracks you can change the key to suit your voice at the press of a button.