Instrumentation
Paganini's original published scoring was for 1 flute, 2 oboes, 2 clarinets, 1 bassoon, 2 horns, 2 trumpets, 1 trombone, and strings.
In the years following the original publication of the work, Paganini occasionally expanded his orchestration, writing out some odd parts to add from time to time in performance: 2nd flute, 2nd bassoon, doubled the horns, added trombones 1 & 2 (moving the existing trombone part to trombone 3 basso), timpani, and banda turca (bass drum, crash cymbals, and suspended cymbal). He never added these into the one and only manuscript score.
Read more about this topic: Violin Concerto No. 1 (Paganini)