"You're the Inspiration", written by Peter Cetera and David Foster for the group Chicago, is from their 1984 album Chicago 17, with Cetera singing lead vocals.
https://en.wikipedia.org/wiki/You're_the_Inspiration
https://en.wikipedia.org/wiki/Chicago_17
https://en.wikipedia.org/wiki/Chicago_(band)
https://en.wikipedia.org/wiki/You're_the_Inspiration
https://en.wikipedia.org/wiki/Chicago_17
https://en.wikipedia.org/wiki/Chicago_(band)