If you sign up for band, you can expect your chances of attending college to rise

dramatically. Music has a magical quality that is somehow interwoven with human
intelligence. Studies have shown that students who participate in music classes have a
high probability of graduating from high school. Imagine how much the world would open
up to students if music education was mandatory—now that's something to sing about!

What would strengthen the underlined argument?
offering the perspective of students who do not take music education yet still graduate and attend university
examining the reasons why mandatory music education is not currently in place in most schools
providing additional information about the number of those graduating band students that go on to college

providing data or statistics that demonstrate the correlation between music education and college attendance