- Song title
- Date the song was created
- Names of all involved parties
- and their role artists, songwriter, producer
- Publishing info for all involved.
- Ascap, emi, bmi etc.
- Contact information
- Name, Phone, Email, Address
- Signature of acceptance and the date.
All parties get a signed letter.
Tip :: I heard that these can also be used with your PRO, but I am not sure how at this point.