When you say say they helped in doing the charts and chords are you talking about arrangements? Also, did you and your sister also work on the charts and chords?
They strummed a guitar to find the right arrangement of the chords we sang to them. so, yes i would say it was the arrangement of the songs. we do not play instruments so we sang the songs to them and they played along and arranged what we sang to them. we both dont mind gving them credit but just want the rights to the songs.
The arrangements are derivative works. In order to have a work made for hire, there must be a specific written agreement. The lack of writing means you do not have a work made for hire. However, they only have a copyright interest in the arrangement and not the song. Since you participated in the creation of the arrangement you also have a copyright in the arrangement. Without your approval they cannot use the song with their arrangement. You as the owner of the song, can use the arrangement with the song. Thus, you effectively control the copyright. I suggest you make that clear to them and that they have no right to use the song since their rights relate solely to the arrangement. That may make them decide to sign the agreement and get paid. Otherwise they don't get paid and cannot use the song with their arrangement.
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