Here are my bands as they might have existed in 1815. There is an S Range band in metal, quite chunky but workable.
The HYTTY band is a one off by that company; the figures a bit flat, but I like them despite their imperfections.
I wish I could get more of the Strelets figures, but these are out of production.
The Airfix Guards band has been decapitated and replaced with bicorns.
Finally, I have converted three figures to make kettle drummers for the Polish Lancers, Horse Grenadiers and Mamelukes - I would love to make a mounted band but this will take a little longer and I doubt these would have been at Waterloo. Anyway, my kettle drummers definitely come under the definition of extravagant!