When you upload your music, you can set the license for the track. The choices are "All Rights Reserved" or Creative Commons.

If you find yourself starting a statement with "I apologise [sic] in advance" then maybe consider not posting it.

That is excellent advice!

I just want to mention that the "[sic]" is not necessary. "Apologise" may be uncommon in the US and Canada, but it is the preferred spelling outside North America.

Oh I considered it.

Just modern slang eh?