Audio synch drifting in music video

Hello-
I just sat down this morning to begin editing a music video shot in DVCPRO HD @ 24fps. The video is performance-based, and, at the shoot, the artists played along to the song from their album (the song was played from a CD and run through a PA) so that all the footage could be synched up to the track in editing.
However, when I lay the audio track down with a take from the shoot, the audio track (imported from their album and converted into AIFF format) gradually loses synch with the video. I've edited several music videos using this same format (the same cameras, even) and have never encountered this problem. The audio settings for the captured video and the audio from the CD match (48khz, 16 bit).
Any ideas?
Thanks.

the issue was that the synch track was played from a CD (on an older cd player, which may or may not have contributed to the problem). The track from the cd fell out of synch with the AIFF as the song progressed, I assume due to the fact that the CD is physically spinning, creating a variable on how fast the data can be read from it (even though there was no discernible difference in speed to my ears or to the artists who wrote and recorded the song) . So, I ended up running that same CD player into my computer and importing the track from the player in real time, which synced up perfectly.

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