Song2Play.com: What Am I Doing Wrong?

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Okay, I'e noticed some folks here have music playing when I've clicked on their profiles. I notice most of it comes from a site called song2play.com, so I signed up, thinking it'd be cool to have one of my favorite songs play when people click my profile. For whatever reason, when I click songs on their page, I get no sound, and even though I copied and pasted the code they provide into my profile for a particular song, when my profile comes up, I hear no sound. Anybody else have this problem, or have some idea what I could be missing? I want give out usernames here, but when I click on certain friends' profiles, I have no trouble hearing their songs. Any help anyone can give would be appreciated.