WSS,

Dont court trouble where it is not necessary.

The moment you credit these people in your CD, their great grandchildren can demand retroactive royalties from you.

I know you are trying to be generous that better safe than sorry.

James Blunt's You're Beautiful has been subject of a multi million suit from this best friend.

In fact, the legal advice is that for real live players for hire studio musicians, if you don't want them to claim royalty, you must let them sign the release form before they have performed a SINGLE chord or note in your studio.

Otherwise, if you let them sign it 3 minutes after they have started strumming, you are already bound to give them royalty.

So, dont credit where it is not legally required.