Because of the Blood
Key of Bb
The first part is a walk up on 2-5, then walk up 3-6, it's a basic gospel walk-up done in many songs...
PCH explains it well, but let me try to simplify a little more since it was asked...
The walk up is...
Cm7-5 - C/C-Eb-Gb-Bb or play it as was played C/Bb-Eb-Gb
BbM/D - D/Bb-D-F
Ebm - Eb/Bb-Eb-Gb (inversion)
BbM/F - F/Bb-D-F
What PCH is saying is that if you take out a little of the theory out making chords larger or diff...you can look at it as below...
C/Ebm
D/BbM
Ebm
F/BbM
Same 2 chords in the right hand back and forth and walking up in the left hand bass from 2 to 5...
The same happens on the next progession from 3-6
DM
E/Gm
DM/F#
Gm
which might look like below simplified
D/A-D-F#
E/Bb-D-G
F#/A-D-F#
G/Bb-D-G
hope this helps a little...
