for vinyls... i go to either goodwill,salvation army,thrift stores, or garage sales... but most of the garage sales and thrift stores have good ones...
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as far as sampling... i don't like to sample anything after 1985... i don't know why... i just don't.... i just read the credits... to look at what instruments... are gonna be on the tracks... i've learned to stay away from orchestra shit.(whiny violins)...i stay away from workout records... chicks talk all over the song... about..."now left foot this time... now right foot this..."
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and sometimes its luck that you find an ill sample...