"Hard Habit to Break" written by Steve Kipner and John Lewis Parker, recorded by the group Chicago, is from their 1984 album Chicago 17, with Bill Champlin and Peter Cetera sharing lead vocals.
https://en.wikipedia.org/wiki/Hard_Habit_to_Break
https://en.wikipedia.org/wiki/Chicago_17
https://en.wikipedia.org/wiki/Chicago_(band)
https://en.wikipedia.org/wiki/Hard_Habit_to_Break
https://en.wikipedia.org/wiki/Chicago_17
https://en.wikipedia.org/wiki/Chicago_(band)