This is "Amazing Grace" arranged for Bag Pipes and Orchestra.  It is in the key of Eb (Bag Pipes only play in Eb) The orchestration is composed to fit very nicely with the harmonics of the bag pipes and brings a celtic open harmonic feel to the arrangement.  The drums also bring a nice 3/4 march style to the work.  This can be performed as an instrumental or you can add the congregation to the work.  It is suggested that the bag pipes play a verse alone before the orchestra joins them.