The Avalanches took sixteen years to release their second album, in large part due to needing to get clearance for all of the samples that they used.

To the point where, I believe, they completely redid a chunk of the album because there were samples they could not get clearance for. They had to contact Paul McCartney and Yoko Ono to get permission to use a sample from a children's choir singing "Come Together".

Actual artists creating amazing art, belayed for 16 years to avoid copyright infringement.

Just a random thought I just had. Probably not related at all.

Edit: should link to the album after all that I guess. It's incredible.

https://en.wikipedia.org/wiki/Wildflower_%28The_Avalanches_album%29