Why not WTC II? I like nos. 2 and 14 the best.WTC I nos. 3,6, 8.How bout Muczynski Toccata? Not as hard as it sounds and I like it better than the preludes.short and showy, too.Ravel Rigaudon from from Tombeau de Couperin perhaps, Khachaturian Toccata, or the last movement from Mussorgsky's pictures at an exhibition (Great Gate at Kiev)
Is Mussorgsky 20th century?
No.