Ccmixter.org have a ton. Also soundcloud. Aside that the usual ways like Youtube.Also keep an eye for remix contests. Plenty of good vocals from a few well know projects/bands for free ,a chance to get featured and earn some $ or other prizes. Source: about 1 year ago

Find some fitting music to use in your videos. Source: over 1 year ago

Creative commons remix community (some are non-commercial): ccmixter.org/. Source: almost 2 years ago

For Free and non-copyrighted samples: CCmixter and Freesound. Lots of good stuff there. Source: almost 2 years ago

Http://ccmixter.org/ tons of music with a variety of creative commons licenses. Source: almost 3 years ago

Some avenues you can consider are sync licensing, becoming a songwriting and selling songs to artists, and doing production gigs freelance on websites like soundbetter.com. Source: 6 months ago

Take a look at soundbetter.com, you can select from any number of engineers and get quotes. It's kind of amazing, might make your search easier. =). Source: 11 months ago

I’ve used https://soundbetter.com for mixing, mastering, and session musicians, but there are tons of producers there as well. Definitely check it out! Source: 12 months ago

You can go check out soundbetter.com, there are lots of arrangers (incl. Me ;) over there and you can see their pricing... Source: 12 months ago

Are you familiar with soundbetter.com? Its a great resource and protected. Source: about 1 year ago