You should be able to do this with Audacity. ItÂ´s free and quite easy to use.
Import your music CD as .wav and plug a microphone into you computer, open Audacity and click the red record button. You need to play around with levels of course until you get the effect you want. When you have both tracks (both as .wav) then open the both together in Audacity and ask it to export this as .wav, then burn it to the CD