If you are a student, ask your school’s music librarian. Many conservatories have standing orders for all Billaudot contest pieces. Your librarian may be able to photocopy a single copy for study purposes (under "fair use" laws, not for performance).
Before hunting for the PDF, it is crucial to understand the composer. Robert Planel (1908–1994) was not a one-hit-wonder. He was a well-respected figure in French music, holding a prestigious Premier Grand Prix de Rome in 1933—a prize that launched the careers of Berlioz, Bizet, and Debussy. robert planel trumpet concerto pdf
: Opens with a grand introduction followed by a rhythmic, driving main section ( II. Lent et calme : A lyrical, "slow and calm" movement ( If you are a student, ask your school’s music librarian
So go ahead: hunt down that PDF. When you find it, play the second movement slowly, with vibrato only at the phrase ends, and imagine you’re in a sunlit salon on the Rue de Paris. That’s where Planel’s music lives. Before hunting for the PDF, it is crucial