What instrument is associated with both Louis Armstrong and Ella Fitzgerald?

The trumpet is the instrument associated with both Louis Armstrong and Ella Fitzgerald, primarily because Armstrong was a renowned trumpeter and one of the most influential figures in jazz history. His virtuosic trumpet playing and unique vocal style significantly shaped the genre. He is celebrated for his innovative techniques and ability to convey emotion through both instrument and voice.

On the other hand, while Ella Fitzgerald is most famous for her exceptional vocal abilities, her music often included collaborations and arrangements where instrumentalists, including Armstrong on trumpet, played a vital role. The rich, improvisational dialogues in their performances featured the trumpet prominently, linking both artists through this instrument despite their differing primary musical focuses.

The other options, such as piano, saxophone, and drums, may be associated with various jazz figures but do not have the direct historical connection to both Armstrong and Fitzgerald like the trumpet does.