I own a chamber music business - providing small classical ensembles for events. Most are weddings, but we also have provided groups for many Viennese balls. I own about 300 works for balls. The full orchestrations do us no good, so we have located pre-WW1 arrangements for reduced ensembles, as well as more recent arrangements. The artistic elements remain - but yes, these were written for popular function. So were Sousa marches. There are countless examples in history of good composition created to serve a need. Would you denigrate Bach cantatas (not on the level of a Strauss waltz!) because they were written in a form applied to a function? Do you scorn fine architecture because it is NOT pure sculpture, but actually an office building? Art does not have rigid boundaries, but is fluid. I have no problem playing a Mozart work at a cocktail party. Possibly, that is why he wrote that! Is it also concert quality composition? Sure - but within limits, no NEED to choose a label.