http://www.utsystem.edu/ogc/INTELLECTUALPR...TY/ccmcguid.htmThis is another good site. It gives guidelines on how far you can take fair use in education where it is perfectly legal.
"4.2.3 Music, Lyrics, and Music Video
Up to 10%, but in no event more than 30 seconds, of the music and lyrics from an individual musical work (or in the aggregate of extracts from an individual work), whether the musical work is embodied in copies, or audio or audiovisual works, may be reproduced or otherwise incorporated as a part of a multimedia project created under Section 2. Any alterations to a musical work shall not change the basic melody or the fundamental character of the work."
That's B.S.