Most of the Strauss works that are performed today may once have existed in a slightly different form, as Eduard Strauss destroyed much of the original Strauss orchestral archives in a furnace factory in Vienna's Mariahilf district in 1907. Eduard, then the only surviving brother of the three, took this drastic precaution after agreeing to a pact between himself and brother Josef that whoever outlived the other was to destroy their works. The measure was intended to prevent the Strauss family's works from being claimed by another composer. This may also have been fueled by Strauss's rivalry with another of Vienna's popular waltz and march composers, Karl Michael Ziehrer.