One of my favorite examples is Elliott Smiths From a Basement on the Hill. It undoubtfully has Rob Schnapf's signature on it, but you can tell he tried to keep the incompleteness in the work - you get a sense that Elliott Smith was in the middle of creating a new sound, and it feels like he was half way there. At any rate - that record was very controversial, despite being guided by those who were close to him and worked with him.