If you're looking to be constantly playing lots of new pieces, a good idea is getting a book of stuff that's a level or two below you, and then running through it. I'm not sure which Country you're in, but if you have piano exam books, maybe pick one of those up. They'll have a lot of pieces from each time period; you can find music that you've definitely heard, and maybe new stuff you've never even heard of. If you have the RCM system, you should look at maybe the Grade 9 or 10 books. I think Trinity System would have roughly the same grading, and ABRSM. Look at some Schubert - Impromptus in Ab+ and Eb+; or Tchaikovsky 'June'Another Bach Sinfonia or a prelude and fugue (C-, D+ book 1)Beethoven Rondo in C majorDebussy - Fille au Cheveux de Lin, Arabesque #1, ReverieA lot of music has fast and slow sections, but that isn't the main focus of the work. Find some youtube playlists, or just go nuts with the 'related videos' function and see what you can come across.
Countrymath,Concordo plenamente com os Impromptu de Schubert; sao bem no seu nivel tecnico e sao lindos, todos. Ao seu nivel tem tanta coisa legal:Sonatas de Haydn B minor e E minor sao dramaticos e nao tao dificeis.A de mozart 310 que ja toca e o mais dificil, entao qualquer outra seria possivel.Brahms Intermezzo 117/2 em Bb minor e agitado e muito do estilo do Brahms, armonias complicada, melodias cheias de saltos, muito tipico.Se gosta de Scarlatti, Antonio Soler tem muitas sonatas com estilo espanhol, varias delas bastante rapidas, mas nao dificeis demais.Em epoca mas moderna, eu gosto muito de Leos Janacek, On an Overgrown Path. Tem varios movimentos, alguns rapidos e com poliritmos interessantes.E, como ja lhe foi sugerido, Bach e um mar que nao tem fim, atualmente estou aprendendo a Partita #1 em Bb, mas as opcoes sao infinitas.Perdoa meu portugues inadequado.Boa sorte,Bill
Sou dos EEUU, mas sou casado com uma brasileira ja faz 26 anos.