Trouble with HTML

Hi,
I am a newbie to wordpress, and I encountered some troubles while editing the posts. So what I am trying to do is to insert a song in the post without using any plugin. And indeed I found a solution by inserting a short HTML code in “custom HTML” block. The code works fine and if I click “preview HTML”, it perfectly works. But when I publish the page, the music just disappears. I have tried to refresh the pages for several time but it doesn’t help. Below is the HTML code, please give me some advice 🙂

<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=330 height=86 src="//music.163.com/outchain/player?type=2&id=18161816&auto=1&height=66"></iframe>

Thanks in advance!