20th Century. Tres Piezas para tromb˘n solo by Mexican composer Leonardo Vel zquez is a 3-movement work for unaccompanied trombone. Movement 1. Allegro scherando is playful with contrasting loud and soft sections that throw rhythmic curveballs to the listener with the odd 5/8 bar mixed in with 6/8 time. Movement 2. Andantino quasi lento is a slow lyrical movement Movement 3. Allegro moderato is sarcastic and march-like with off-balance rhythms including a 2-voice middle section that challenges the performer to convince the listener that there are two lines....a syncopated bass line and upper melody line. - the publisher