Cacophony

A cacophony is a harsh mixture of sounds. It descends from the Greek word phōnē which means sound or voice, and is joined with the Greek prefix kak-, meaning bad; creating the meaning bad sound. In a similar way, the word symphony (which means a harmonious arrangement of instruments) traces to phōnē and the Greek prefix syn-, which means together.

E.g. I couldn’t hear over the cacophony of alarm bells.