I remember before soundcloud there was and surprisingly still is a soundclick, and when everyone was on it, big name to hometown producers were leasing beats for .99¢ to $10, and rappers were rapping over those said beats on their soundclick pages (sounded like they were using their headphones as microphones too).

Never understood the leasing beats situation, and it was even funnier when I saw a Judge Karen episode where some kat was sueing a producer for letting someone else use the beat but obviously didn't understand what leasing meant.