Remix Culture describes the appreciation and participation of remixed media. A remix can be defined as taking one or more media and through the process of editing creating a new product. These can include remixed songs, which can have one or more originals, or remix videos, which fundamentally change the way the original content was intended. Popular examples of remix culture include The Shinning trailer remixed, and The Grey Album.
There are many subcategories of remixed media. The following are some examples.
There are massive communities for remix videos and music all over the internet. Web communities such as OverClocked Remix are sprawling networks of artists remixing various video game themes. These sort of communities are fairly easy to find for any type of music.
Likewise, animated music videos, or AMVs are very popular on sites like YouTube. The idea is the same as any remix video: take source material and turn it into a new product. However in this case the subject matter is animation.
Unfortunately, the remix culture is being inhibited by Copyright battles--most notably those against music remix culture. While recently, the mashup has enjoyed commercial success from artists such as the Pittsburgh-based Girl Talk, other artists, such as DJ Danger Mouse's of the aforementioned The Grey Album fame, encountered much resistance from EMI and other figureheads for the music industry.
And while not strictly limited to the music industry--as was demonstrated in the controversy of the Youtube broad-casted Yu-Gi-Oh Abridged Series--it is the entertainment branch that seems to feel the most threatened from the ballooning remix culture phenomenon.