Hi
First thing would be to separate out the song/songs you want from your videos.....
Open VP and load a music video (in a compatible format). Once on the timeline and fully cached, move the red cursor line (or play the timeline) until you arrive at the start of the song you want to save. Now split the timeline.
Right click the section to the left of the split and select Delete(ripple) from the menu. This removes that section. Continue to play the timeline (or move the cursor) up to the end of the song. Split the timeline once again. Now (provided you don't want to save any songs further along the timeline) right click on the section to the right of the split and Delete (ripple) this.
You should now be left with the required song which you can export as a stand alone clip.
Once you have done this for all the songs you wish to save from the different videos, you will have your songs on separate clips. You can now open VP and load all the exported clips, rearrange them as you wish, add transitions/titles etc. and finally export the whole as a new video.
An alternative to splitting and deleting bits of the video (which is logical and akin to handling cine film) you can preview the video in the Clip Preview window. and then use the Start and End markers (red and blue brackets) beneath the window to isolate the section you require. The timeline will automatically show only that section and can be exported as mentioned above. This has the added advantage in that after the export you can re-adjust the Start/End brackets to isolate a different section of the same video and export that.
Nat