Beethoven Piano Concerto No. 4, 1st Movement - One of Beethoven's best work. It is one of the best concertos even though it was not composed to the ideal flow that the soloist and the orchestra, alternate episodes of opposition, cooperation, and independence.
Vivaldi Flute Concerto in G Minor - Simple but beautiful flute concerto, even though it is just solo flute with accompaniment of an orchestra. I was looking for a horn concerto but came across this one.
Haydn Trumpet Concerto, 3rd Movement - The music is a perfect demonstration of Haydn's sophisticatedly gentle, clear, and smooth style. The solo trumpet almost runs throguh the entire movement with just a little bit of decoration of orchestra.