I sure wish that there was some sort of gizmo that I could put the songs in that would change the key. So I could play the charts with the recordings on all of the songs.
There is such a gizmo. The Marantz SuperScope.
[Invalid or Expired Link Removed]
Here's what you are looking for. I've had one for years and it's terrific.
Significant improvements in Superscope's real-time tempo and key change controls for CDs and now MP3 files. Slow down a song even further with better quality: up to 75 percent, while retaining the musical pitch of the original. Or, shift the key of any song at the touch of a button up or down as much as an octave, in half steps or finer increments, while the tempo remains unchanged. A CD or CD-MP3 can also be fine tuned to match an instrument. All of these changes may be recorded onto a new CD as a take-home custom accompaniment.