Track 2 from the album, "Chicago V" (1972). Full "Chicago V" album playlist ...
Chicago performs "All Is Well", from "Chicago V" album.
Here's a partial isolation of the great Peter Cetera's bass track , and Robert Lamm's lead vocal along with some great drumming via Danny Seraphine.
The full album of Chicago V is now available in AJFOne's thread over at the C3 forums.