On GotSound.org we are using wavesurfer.js to play sounds in a browser.
It's works only in modern browsers supporting Web Audio.
MediaElement fallback to support old browsers like Internet Explorer not always works.
You can find more information about browser supported Web Audio API here.
Please, consider to upgrade your browes to one of the following:
This is a drum recording i just made. Nothing special, but hey, it's a sound file, and it's free. :) Gear used: Olympus LS-14 digital recorder and Sound professionals SPBMC-3's. The mics were cliped onto two plastic containers behind the kit to give the recording a more ambiant feel