Just stumbled upon this site that has a lot of free beats to use in your original compositions.

They also have a nice selection of premium beats you’ll have to shell out $20 for.

20DollarBeats.com

1. How to Make Rap Beats
2. How to Roll Your Own Beats From Scratch – The Easy Way
3. Rap Beats And Hip Hop – How To Set Yourself Apart From The Rest Of The Aspiring Rappers And Singers
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5. Hip Hop Beat Production Software – Rappers.org Weighs Your Options