hello webmasters,ineed a plugin that would enable my client to download either music or video from my site.plz who can help me with wordpress plugin for download button?.

Sometimes this option comes with your theme(in the shortcodes section). but here http://wordpress.org/plugins/easy-media-download/
you can try that.
p.s Don't forget to read the documentation on how to use it. You can read it below on that page, or download it.

Cm download manager Or Easy Media

thanks guys