Here is how to play music straight into the chat:
Turn "voice activation" on instead of "push to talk"
Disconnect your audio plug from the speakers, or whatever you have, then plug it into your input(I don't know, but it's a red-pinkish plug for me).
Some computers like mine, a Dell, record sounds in such a way that you have to play it really loudly to hear it. If you have a mic, you will hear it normally, but, if you attempt to play it in the chat, it might not be easily heard.