Furthermore; you can't just go selling samples without clearing all kinds of shit; you'll have to ask the band, as it would seem they paid for the recordings. You'll also have to ask each and every drum manufacturer for permission to use their names, if you intend to tell people what crash you used, or what snare, etc...
He doesn't have to ask the band, that's complete and utter bullshit. The bands neither own the rights to the recording (if they're signed to a label) nor is their intellectual property infringed.
He
might would have to ask the specific label the record appeared on if it's stated in the contract that everything recorded in that session is going to become the label's property upon completion/payment. The deals usually don't run that "deep", though.
And to avoid brand name/trademark infringement, he can just change the name to something quite obvious. As he would have to with the bands.
And Joey, for copyright protection you should look into digital watermarking. Maybe Shane/Kazrog can give you some pointers in that direction.
Also, if you plan to continue releasing these packages, you might want to think about getting it covered in your contract, that the individual samples belong to you and that the band agrees on letting you use their name for advertising those. Just to make it waterproof.
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And I think it's quite likely that you'll find an audience for this. Quite some people have complained about the Slate cymbals (I don't necessarily agree) and not everybody can afford to have both, S.2 and Slate. So this could fill a gap...
Pricing should be reasonable though because people probably won't be willing to shell out that much for cymbal-only packs.
Product and price variation, based on the amount of cymbals included, are also a possibility (like Slate EX, LE, Platinum etc.).
And you may want to think about giving away a set of samples for people to demo it.