what do you call your Composition: in a band situation for a SONG. i think= if it is a song that includes bass, drums guitars or any other instrument harmonies and the person who wrote the chord structure, melody and all the instrument parts ,and all his ideas are played exactly the way he wrote them. now 1 if the person comes up with a complete chord progression and a complete melody with no other instruments arranged or composed by him lke especially the drums, guitar solo, other instrument harmonies. and the rest of the band works on it to make it a complete song. Is it still the composition of that person who came up with in the first place. 2 if the person comes up with a complete chord progression and melody but later some parts of it like the verses are changed (along with the chord progessions)by other band members and keep the rest as it was. then whose composition is it. 3 if the person comes up with a complete chord progession and melody which requires other instrument harmonies and guitar solo . whose composition is it.