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Depends on how much of the track contains her work . Vocals ie song 50% , sampled noises much less ! Offer here a buyout fee if you can afford but if it's a small project share of profits after costs usually. Drafted contract usually makes people feel better but nobody can afford a lawyer anyway . my experience of these being contracts are fucking worthless in the music business !
Depends, I think. Could offer a nominal fee and writing credit now. Who owns her recordings?