Inconceivable! A timely thread. Am working away on Brandt's 6th orchestral etude: an arpeggiated waltz that whirls (vertically mostly) and floats/flies (horizontally mostly) begging soft kisses of Bb's atop the staff here and there. Soft is good. My rudimentary skills dictate a measure at 58. NOT 76 as Vassily would have it. If I practice at an mf+ or forte and bang out notes a few things happen: I tire. Whirling and floating (even at a slow tempo) bug-out & the evil squatters slogging and thumping take up residence. The waltz becomes some sort of a Gonzo v Cookie Monster chest thumping icky thing. I bit off more than I chew, certainly.