All of Otto's 1880 "Sweetest Dream Waltz" may be found at " Music for the Nation,American Sheet Music,1870-1885". That is a Library of Congress site. Otto was only 17 in 1880. The music reflects that. It does suggest some later tendency toward the dramatic. The 6/8 intro has hand crossing;voicing from soft to loud,twice;and an ad lib flourish at the end of its 11 bars,all Allegro. The B flat key continues as the pace becomes Tempo di Valse, 3/4. Call this the B section (the intro being A).B is 32 slightly syncopated bars,then repeated. The next(C) section goes into key of F for 32, more or less 1-2-3,1-2-3 rhythm,bars,also to be repeated. The key slides into B flat again to essentially reproduce the mood and melody of section B in 32 bars without a repeat. The E flat finale is slightly off a straight 1-2-3 count, 16 bars,and is repeated. Many pianists can play this work. That would not be true for most of what Otto wrote,say,between 1884 and 1910. There are many errors on this Message Board,notably in names and spellings of places in German lands.Also there are assorted pieces of misinformation.