Then we cut it all up and rearrange it to make new art, social commentary, parody, and contemporary criticism. It's nothing new. Artists have been making collages for the last hundred years. The world of Fine Art has long recognized the artist's right to use found objects in a new context to make a comment. The world of music has been a little behind.
Record companies reject our works outright, wishing to avoid unpleasant lawsuits.
CD Plants, acting on an RIAA mandate to curb piracy, are often not willing to press material that might contain recognizable samples. Even free music venues on the Internet refuse to allow sample-based works. Depends on who you ask. We know we are protected by the First Amendment and the Fair Use clause of the Copyright Act. Apparently, the music industry has other ideas.