i am musician trying to work out the contractual details with a singer/vocalist in the united states (i myself am located in germany) and communication is happening solely over the internet - obviously only the vocal parts will be provided by the vocalist and will be payed for by me, i will need all the rights so i can sell the song without getting sued later on
are there any resources / templates on how to write up a contract covering such a "overseas" deal ?
how would this work out if the vocalist wants a percentage of all the earnings of the song and how would i go about correctly proving to said person the earnings info when they are coming from all kinds of different sources like spotify, youtube, itunes etc... ?
i am kinda lost on where to even begin so any help will be greatly appreciated