An atypical pop hit feature

In my positive review of Chicago's "Colour My World" February 25, I neglected to mention one of its attributes.  It's the ticking metronome, which you don't hear often in most pop hits.  The decision to use a metronome and feature it so prominently in the song makes it even more moving, I think.  The determination to have rhythmic precision while while playing the piano suggests that the band wanted to get the tune just right, and it underscores Terry Kath's vocals appropriately.  It's a smart quality to have when playing and singing about how much someone means to you.