He's crying because he can actually kinda hear his own music through the power of 21st-century headphone technology.
The word "/mu/sicians" in the second panel is a reference to the music board on 4chan. Credit where credit is due!
Here be LOLs most amusing and historic!
How do you choose? You could make an argument for any of these three as greatest composer ever!
4chan is at It Again With Their Trolling of iPhone Users
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Gif of the Day: Cats Must Really Have Nine Lives Because ...
Let's Just Pretend None of Us Ever Saw This
They Just Might Have Chosen the Wrong Drummer for the Job
Deadpool Movie Officially Coming in 2016
Getting The Next Step in Your Relationship
The Secrets of Cleavage Revealed!
Amy Poehler's Advice On Doing Things Before You're Ready
Pick Your Site Name
Tell me more