The theme for the SOTM is Party Party!
Pros:
I approve the message 'Drop the Bass' because most people would be familiar with that phrase and their minds would go to clubs, dancing, and especially partying.
The colors for the words are spot on. Readable, playful, colorful, and certainly gets the message across.
The background is right because it backs up the phrase you used.
Because you used a bright color palette for the words, it was a smart choice to have those big basses and systems in a slightly darker, but visible color to give the ambiance of a night cub.
Overall, good size and good quality.
Cons:
The major con is the main subject. Basically the girl.
If people didn't have a sense of humor, if they didn't think any deeper without a second thought, and if they are new to the SOTM or anime, the girl wouldn't work.
Why?
Most people, in which I am sure you have encountered, are put off by sadistic looking, creepy looking things. Despite her girlish appearance, red eyes are glowing.
When people think of party, they want more of a fun celebration. A good time. People want that feeling of being in a good mood.
However don't let that deter you. Like I mentioned, if people actually gave a second thought, the girl would work well with the overall message because the term 'drop the bass' means to give something a heavy feeling in which the girl definitely provides.
Suggestions:
Besides the ones I mentioned, I think it is mainly if you do decide to change the girl or figure, I recommend something that pops. Basically, a girl that people would like a second glance or more to look over.
Also, maybe a few more lights or one or two bright colors near the corner of the sig or a slight sparkly/glow effect. Make it appear magical and I'm sure more people will come to your party.
I hope I helped~ :3