A track from Chicago when they were a credible band featuring Terry Kath, a little known but superb guitarist. Another one who died tragically early

 

https://www.youtube.com/watch?v=7uAUoz7jimg

Chicago - 25 or 6 to 4 | Live at Tanglewood (1970) Explore the sound of Chicago with "25 or 6 to 4 - Live at Tanglewood 1970" - a high-voltage early performance of one of the band's most iconic tracks, delivered during the rise of their horn-driven rock era. Captured live at the scenic Tanglewood