Chemistry

This is basically about how chemistry is defined, precise in it's own nature. When you add one thing to another it's ALWAYS the same. In contrast, when human individuals connect it's always a different outcome.

In a 1986 issue of Guitar for the Practicing Musician, Alex Lifeson said: "Very often the guys will have worked out something musically and made a tape of it for which they have nothing particular in mind. 'Grand Designs,' on the last album, was done that way. They had the musical ideas laid out and just made a little tape for me with guitar, keyboards and drum machine, and I had that. So, again, if I'm stumped on something that I've been working on, I pull out that tape and try to close my mind off for a minute and listen to the tape. 'Chemistry' was a true collaboration between the three of us. The other guys had a couple of key phrases they wanted to express, so they gave me the music. That was easy because all the groundwork was done. Playing with words comes so much easier than having to dream up the whole thing."

While most Rush songs are written solely by drummer Neil Peart, the lyrics and music on this song are credited to Geddy Lee, Alex Lifeson, and Neil Peart. This is the last song that either Geddy Lee or Alex Lifeson are given credit for lyrics.