English Idioms and Phrases: Face the music
To face the music means to accept the usually unpleasant consequences typically relating to your own actions. This is usually in the form of a punishment or reprimand.
"I was drunk and I embarrassed all of my friends, now I need to face the music"
"Stealing that car was a crime and now I need to face the music".
This phrase originates from the British military. In the army, when someone commits a crime or disobeyed orders, they may receive a court-marshal. Traditionally there was a military drum squad playing a beat i.e. music from the drums. Therefore if you were court-marshaled you literally had to receive a punishment to music and thus the phrase face the music began to be used.
This phrase is strongly connected to 'drummed out' or 'drummed out of the military'.