But they try to portray themselves as really devout. Muck, chuck and suck. The music of this canon was once thought to be by Mozart but was shown in 1988 by Wolfgang Plath to be by Wenzel Trnka. No mention either of quot;La Clemenza di Titoquot; the opera that had just failed in Prague, thus placing even more pressure on Mozart to succeed the next (and last) time, with quot;The Magic Flutequot.