The Boys in the Band gather for this cabinet card photograph by photographer John Strunk, in Reading, Pennsylvania. The uniformed brass band consists of four member. A consultation from the Cabinet Card Gallery’s unpaid research department would be helpful, but for the time being, I will identify the bandsmen’s instruments as being a clarinet, trumpet, french horn and a flute. To view other photographs by Strunk, click on the category of “Photographer: Strunk”.
THE CABINET CARD GALLERY 
I’d say that the leftmost instrument is almost definitely a clarinet. Initially I also was sure about the trumpet, but on second thoughts it may be a cornet. The third instrument is definitely not a french horn—I would say it is a euphonium (or possibly a small-sized tuba; I’m not really familiar with them.) The rightmost instrument is too small to be a flute (of the modern concert variety, anyway) and more resembles a piccolo.
With a piccolo and a clarinet, though, I’m not sure they could be considered a “brass” band, as those are both woodwind instruments.
Just stumbled across this post and thought I’d offer my two cents. 🙂
Thanks for the information about the musical instruments. I guess you are right that it is not legitimate to refer to this cabinet card as a portrait of a brass band. Perhaps I should call it a “half brass band”.
I agree the third instrument is not a French Horn. To me it looks more like a Tenor Horn or a Baritone. Both are similiar in looks to a Euphonium, which is the smallest instrument in the Tuba family, but are smaller again.
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I have a similar photo of these four men and their instruments. The third one is possibly my great grandfather Peter Eckenroth. Not sure who the rest are. My photo looks like it was taken maybe a couple of years after this one.