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I don't know if CS4 will do what you want or not with any of its regular features, but you could always mixdown all the video tracks you have minus the music, then bring the new AVI file back to the timeline and just mess with the playback speed of that particular video track until it matches the length of the music track. That's relatively painless to do.
I suggest you need to do it manually so you can craft the edit to the audio track. Automating the edit will be kind of robotic(IMHO)
CTRL-Drag the end of the clips you want to lengthen /shorten or use the Trim Window.
You could try this: nest video and copy audio into new sequence, then use the strech tool for the video.
> How do I do that?
I did quite of few of these projects in years past, and the way I delt with
this problem was to use a workflow that allowed changing the image duration
near the end of the project. When the project was near completion and all
the music was done, that's when I determined the total length of the music
and calculated the number of frames per image required to match. Then, I
deleted all the images from the project and imported them one last time
after setting the number of frames in the preferences, and then put these
images on the timeline using automate to sequence. If I only had one
transition, I set that in the preferences too, and if I had various types of
transitions, I added those as the last step. It's a little tedious, but is
easier when planned from the beginning.