* The music was so loud, it was like a sonic boom. (Simile using "like")
* The music was as loud as a jet engine taking off. (Simile using "as")
* The music was so loud, it felt like my eardrums were about to burst. (Simile using "like")
* The music was as loud as the roar of the crowd. (Simile using "as")
You can also use "like" or "as" to compare the music to something else entirely, like a storm, a waterfall, or even a raging fire.