New music is often just old music put together in different ways. There's only so many notes you can play, tunes you can sing, words you can string, you know? It's just how it works, music sampling happens whether it's acknowledged or not. For an entertaining look at the history of sampling, watch the video above. It's everywhere.
The "Brief History of Sampling" video was made by Eclectic Method to showcase how some of the most noted breaks and riffs have been used over decades. Eclectic Method describes its video as:
A chronological journey from the Beatles' use of the Mellotron in the 60s to the sample dense hip hop and dance music of the 80s and 90s. Each break is represented by a vibrating vinyl soundwave exploding into various tracks that sampled it, each re-use another chapter in the modern narrative.
I love how the video is designed, it makes it easy and seamless to follow the trail.