Conversation so far:
What song did Al Kooper make that was covered in the album BS&T 4?
Al Kooper's Holy John (John the Baptist) was covered in the album BS&T 4.
What year did Al Kooper start singing in Blood, Sweat & Tears?
Al Kooper, Jim Fielder, Fred Lipsius, Randy Brecker, Jerry Weiss, Dick Halligan, Steve Katz and Bobby Colomby formed the original band Blood, Sweat & Tears in 1967.
What was the name of one of Blood, Sweat & Tears' albums during the Al Kooper era?
After signing to Columbia Records, the group Blood, Sweat & Tears released Child Is Father to the Man.
What year did Al Kooper retire from Blood, Sweat & Tears?
Al Kooper departed the band Blood, Sweat & Tears in 1968.

Question: How many years was he with the band?
Self-contained rewrite: How many years was Al Kooper with the band Blood, Sweat & Tears?