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I'll add one more

5. Once you find a band you like, pull their tour dates. See who they're opening for or who their openers are.

6. Go to whosampled.com and figure out the originals. Whom do they cover, whom do they sample.

Younger artists cover older artists all the time; when older artists cover younger ones, that's probably a recommendation.

Examples: Dolly Parton covering Joan Jett; Alla Pugacheva and Sofia Rotaru covering t.A.T.u.