Saul, I think that the "boombababoombababoom" part is from a song called, if I remember aright, "The First Battalion's Home." Gibson and Camp did it with another on the "Gate of Horn" album in the way you remember it.

Boombababoombababoom
Twelve riders in the gloom
The drums are low and the pace is slow
But the first battalion's home....

There is a battle
Ragin' somewhere
And it's thunder shakes the groun
Terrible silence
When it's over
Only dead make such a sound.
And a scene
Oh yes a scene
On the first day of July....

They might have worked "Two Brothers" into it as well -- I don't hve the CD handy.

Another powerful song is "In The Hills Of Shiloh" by (I think) Shel Siverstein.