CACOPHONY

harsh, jarring, discordant sound

dissonance

/a loud harsh or strident noise

loud confusing, disagreeable sounds

SYN - clamor

"He couldn't hear anything over the cacophony of these New York streets."

"He was supposed to be hearing some sort of music, but it was all just unbearable cacophony."

"He had been in a deep sleep until the cacophony coming from the hallway awoke him."

"She needed the ear plugs to deal with the cacophony of hundreds of students attempting to talk over eachother."