I would say the best form of study is in practice and that sampling at its best is very organic and is just a matter of listening and being present.
I’ve been making beats since my early teens with my roots being in making stuff with dilla, 9th wonder, and premier in mind and now sampling is at the root of everything I do.
With the advance of technology, stuff like even granular samplers you can literally take seconds and even less of sample material and stretch it into a drone.
Even as I get older I find myself on the floor at record shops going through the dollar and sale crates and I feel like it doesn’t necessarily matter to hide sample sources. but typically I chop em up or filter and distort them enough that it sounds that it doesn’t sound much like the original all though I’m all for simple loops that are easily recognized and have plenty of beats like this too. There’s plenty of producers exploring that and I see it as a form of minimalism and beautiful really. Sometimes without even layering any additional drums.
I have no worries of being sued and maybe I should but I feel like that’s how the art form started. I guess from a sort of punk ethos. I’d imagine if I’m able to get sued I’d have enough money or support to handle it lol. I figure if the song is that big you should’ve made some money off it if they’re looking for money.
But yeah this rant aside, I think the art of sampling lies in tastes, a sort of meditation while listening and an open ear. I’ve sampled from movies, conversations, walks through the city, records, radio, tapes, my own beats and sketches. Literally anything and everything.
The only thing i won’t sample from nowadays is from YouTube (too many cat’s pull from the same channels) and streaming services because it just feels a little taboo. I think one of the best parts is just digging and finding what the universe throws at you