Joe Cocker - I'm So Glad I'm Standing Here Today, Live in Grammy. The Crusaders were a Jazz/Soul group led by Joe Sample, a piano player who wrote this song with Will Jennings. The Crusaders used many guest vocalists, and Joe Cocker sang lead on this (it appears on his album Ultimate Collection). The message of hope after overcoming difficult times was a good fit for Cocker, who battled alcohol addiction in the '70s. Will Jennings told us: Joe and I wrote quite a few worthy songs over the years,