If you have any fear of someone at a studio claiming that they wrote your song, then you should register the copyright in your musical composition sooner than later. Why wait until you have a finished sound recording? For a $35.00 dollar fee to the Copyright Office you can register the copyright in the words and music of your composition by uploading a copy of the telephone recording. The registration (and proof of ownership) would be effective as of the day the copyright office receives the...
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Valid contracts are binding. There may be continuing obligations from you to them, and perhaps from them to you as well. I would need to see the actual agreement you signed to see what obligations and liabilities may have existed prior to termination and subsequent to termination. I have drafted or consulted on numerous entertainment and film related agreements over the years.
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