Does anyone understand the last scene in the movie 'Master and Commander'?

Does anyone understand the last scene in the movie 'Master and Commander'?
The doctor aboard the Acheron was actually the captain and Aubreyrealises this when Maturin tells him the Acheron's doctor diedmonths ago. Realising the French captain is still alive, Aubreyfives orders to beat to quarters to stop the Acheron's captainbefore all hell breaks loose. While the crew assumes battle, Aubreyand Maturin play some Boccherini showing their love of music.