What are some allusions to this poem?

Hey everyone! I was wondering if anyone could help me out a little bit, I have quite a few questions. But if you can't answer them all, then that's perfectly fine (just answer as much as you can, please)! I'm writing about the poem "To an Athlete Dying Young", and I'm puzzled about what the Sound/Rhyme/Rhythm, Allusions, Symbolism, are. If you could help me out, that would be great! Thanks :)