For 10 points, name these works for a keyboard instrument and orchestra.
Prokofiev's C-major third work in this genre begins with an elegiac clarinet solo. Bartok's first work in this genre begins with ominous repeated notes in the timpani. Shostakovich's first one of these works uses an orchestra of only strings and trumpet. Gershwin's only work in this genre also begins with a timpani solo and is in F Major. Rachmaninoff's second work in this genre was his first piece after a period of writer's block. Paul Wittgenstein commissioned Prokofiev's fourth and Ravel's D-minor works in this genre, both of which only use the soloist's left hand. For 10 points, name these works for a keyboard instrument and orchestra.
Prokofiev's C-major third work in this genre begins with an elegiac clarinet solo.
piano concertos [accept any answer indicating concertos or concerti for pianoforte and orchestra; prompt for instrument on just "concerto" or word forms]