In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Nielsen wrote three concertos: the Violin Concerto, Op. 33 is a middle-period work, from 1911, which lies within the tradition of European classicism, whereas the Flute Concerto (without opus number) of 1926 and the Clarinet Concerto, Op. 57 which followed in 1928 are late works, influenced by the modernism of the 1920s and, according to the Danish musicologist Herbert Rosenberg, the product of "an extremely experienced composer who knows how to avoid inessentials." Unlike Nielsen's later works, the Violin Concerto has a distinct, melody-oriented neo-classical structure. The Flute Concerto, in two movements, was written for the flautist Holger Gilbert-Jespersen, a member of the Copenhagen Wind Quintet which had premiered Nielsen's Wind Quintet (1922). In contrast to the rather traditional style of the Violin Concerto, it reflects the modernistic trends of the period. The first movement, for example, switches between D minor, E-flat minor and F major before the flute comes to the fore with a cantabile theme in E major. The Clarinet Concerto was also written for a member of the Copenhagen Wind Quintet, Aage Oxenvad. Nielsen stretches the capacities of instrument and player to the utmost; the concerto has just one continuous movement and contains a struggle between the soloist and the orchestra and between the two principal competing keys, F major and E major.The wind concertos present many examples of what Nielsen called objektivering ("objectification"). By this term he meant giving instrumentalists freedom of interpretation and performance within the bounds set out by the score.
What are the names of the three concertos written by Nielsen?