Terry Kath and Chicago - Learn 25 or 6 to 4 on guitar. This complete guitar lesson has 11 video files, including 3 Lesson Videos. Lesson 1 covers the first half of main guitar solo. Lesson 2 covers the second half. Lesson 3 covers all of the other lead guitar licks in the song. The other 8 files are slow-motion video with on-screen tab, covering every guitar lick in the song.