I recorded a song with my mp3 player, everything is great but the sound is not pure... its clear that it is recorded...
is there any way to make the sound seem better?

many audio editors have tons of filters. Depends exactly what it wrong with your recording. Is it just noise and hiss?

If so then there#'s loads that will likely help you out. I happens to use Adobe Audition personally. I think it's great but then I've not used anything else so can;t really compare too much. It has great noise filtering though. Adobe have a 30 days trial you could download.

Unless anyone else has any other suggestions that is....

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I'm not young enough to know everything!

If we could get a bit more information on what you mean by the sound not being pure, we could help more. Is it too low, too high, crackling, hissing, is there a mains hum noise coming from it, more details please.

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Better than a poke in the eye with a pointy stick any day...