By the 19th century music concert series would become a pervasive practice. With the exception of opera, though, this was not the norm in the 18th century, so harmonie made its mark instead as popular social entertainment. As Harmonie provided "dinner" and "after dinner" music for the emperor in Vienna, it was also popular among the lower aristocracy and wealthy middle class who clamored to have their own "in house" Harmonie. No better example exists than the scene in the second act of Mozart's opera Don Giovanni where the Don's private Harmonie entertains him with popular melodies during supper. Not to be left out, the working class began hiring Harmonie for special events such as weddings.