beatport is a good resource for legit music.
'Free' music is readily available from legit sources such as soundcloud etc without going out your way to rip artists off.
Free acapellas can be had from http://www.acapellas4u.co.uk/
There are also plenty mash up sites where artists and remixers put up their work for download if you take the time to look for them.
You can build up a legal, morally decent catalogue without spending a fortune or resorting to bit torrent sites.
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