The trumpet section plays the melody during the introduction.
During his solo, the lead plays a soprano trombone. It is smaller and higher sounding than the trombone we looked at, but the slide is a giveaway.
The famous piece of music is known as Flight of the Bumblebee. It was a very short section in an opera by Rimsky-Korsakov. It didn’t originally have a name since it was only a short interlude. However, Rachmaninoff’s arrangement for piano established it as crowd pleasing favourite in its own right.
If you look it up you can see people playing it on other instruments as well!
The instrument featured in Havana is a trumpet.
The piece by Mozart is his Horn Concerto No. 4
It is in a major (happy/bright) key, and is classical music.