Caedmon's Call traditionally used this as an a capella intro
for "Hope To Carry On" and did both songs in Db.  Cliff's
guitar is tuned down a half step, and he strums xx0230 (Db)
for pitch before each verse.  Derek is probably standard-tuned
capo 4, and he also strums x02200 at the beginning.

* The originals are on the Rich Mullins album "Never Picture
Perfect": track 1 is "I Will Sing" (a capella) and track 2 is
"Hope To Carry On".  They're both in Db also.