Assuming you mean, use MC to broadcast music...
The licensing requirements for public performance of music, including broadcasting by any means, are quite stringent and complex, and require precise playlist control, and logging and reporting (and payments) that are not capabilities of MC that I know of.
And keep in mind there are two levels of licensing -- songs, and recorded performances of songs. Both are protected by multiple levels of copyrights and licenses and laws.
The only way to avoid all of this is to broadcast only self-composed and self-performed songs, or songs where licensing is directly obtained from composers and performers. That's a small niche for MC to target.
If you mean, use MC to broadcast video...
Same basic legal factors, since every creation is copyrighted (automatically) by its creator and/or licensees, who have total legal control over use of their works. Only truly original work, containing nothing that is copyrighted (no background music, nothing) can be freely performed/broadcast without a license, etc. (I know this is widely ignored, lots of violations on YouTube, for instance, but that doesn't make it legal.)
