If you are using samples of any kind
Make certain that you have the right to legally use them in commercial works.
This may be an issue later on in the contest - Any submission that smells of uncleared samples will be flushed away and the person who submitted the track will be disqualified from this MAC and possibly from future MACs as well.
Remember - Your submissions are for consideration by The Behemoth for potential use in a commercial release. You MUST have a proper license for any samples that are used.
CHECK YOUR EULAs !!! Not all of them are equal - You are required to have legally purchased samples and you must also have been granted a royalty free for commercial use license agreement.
If you have downloaded any samples that from any third party site (not from the original author) then delete them before you even start on your submission(s) so that there is no question of potential rights infringement.
Keep in mind that your submissions must also be created in-full on legally licensed software.
If you didn't pay for it, then you cannot legally use it.
If you're not 100% certain, then don't. We will all err on the side of caution on these issues.
I am not licensed to practice law in any state. I am not in any way legally affiliated with or claiming to represent NewGrounds,The Behemoth or any other person, business or entity. Standard long-distance rates will always apply. Financing subject to credit approval. In the case of malfunction, user assumes all liability for damages and costs incurred both real and imagined.