This such a difficult one to answer!
There are several ways I could go...
Do I pick my Dad's Regimental March that I grew up with (Begone Dull Care), or one of the pieces from the Argyll and Sutherland Highlanders of Canada which I fondly remember (The Campbells are Coming & Black Bear - most the neighborhood kids were in 2347 RCAC). Finally I could choose a piece that I played with BTTB (any Eric Ford pieces or Sousa) or RHLI Regimental band (Zorba the Greek or any of the marches - that would definitely please Gordon...)
Hmm.....
Decisions...Decisions...Decisions...
I will go with "Strike Up the Band" (Ford version), as this was always the 1st piece that BTTB stepped off to. I remember watching the crowds clapping along. Funny enough, I still have it memorized...even though it has been 31 years since I aged out.