How can I make "videosongs"?
Their main software tools are Pro Tools for audio and Final Cut Pro for video editing, on MacBook Pro.  Here's Jack's list of gear:  http://jackconte.tumblr.com/Gear

Jack and Nataly gave a tutorial on making videosongs at CELLspace in San Francisco for the Disposable Film Festival a few months ago.  Unfortunately only the song performances afterward have been posted to Youtube so far.  Perhaps if you contact DFF you can track down someone with video of the tutorial and Q&amp;A session.

Perhaps another tool will be able to meet your requirements.
http://en.wikipedia.org/wiki/Comparison_of_video_editing_software