Back in the day when you had crates of vinyl you had to extract and compress your samples from them to compose a track. The industry standard for accomplishing this was the SP1200. It let you dissect a song and isolate specific sounds then manipulate them before putting em in the loop behind a drum pattern if you so choose. There are quite a few VST's that essentially do the same exact thing, minus the analog component from the age of the crate. So to answer your question, the process requires expensive (or pirated) production software, the proper plug-ins/ VST's along with the applied knowledge on how to use it and voila! you're making instrumentals without needing the original masters.
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this kinda beats my favorite I just wanna speak can’t contain it wastin away chasin the days where in my head I made it remain nameless I don’t wanna look at your faces I’m not fake I still chill in the snake pit stabbin at my head I can’t take it I hate narcissist’s regardless of they sad fazes you know me I’ve been in a wasteland where I like to meditate and do things that one day could make me famous no matter what I’mma hate it most hated so much hatred no fun when my head is racin might not win but imma make it Might stop when I break it chill I don’t mean my bones never see my bros always runnin like it’s chrones say I’m coming to a close see this smile I take it off more then clothes let the drug hit til I overdose let the love in cuz I’m broke yeah I’m sufferin I wanna know Why I’m so insane cutting at my veins fucking bitches in the rain keep me entertained I’m walkin on a tight rope die slow pipe hoes eyes closed I’m so cold I’m made of snow It’s red