Intertextuality

Intertextuality is an area of postmodernism.

The main concept behind it is the influence a text has on another, and the similarities between the two. One feature of intertextuality is pastiche, which is denying the existence of the original form.

One music video that uses intertextuality is the recent 'Treasure' by Bruno Mars



This video, despite being released in 2013, is styled just like and an intertextual reference to a music video from the 1970s with the costumes, setting and the camera filter among others. In this case intertextuality could be used to have a wider range of audience, because it will remind the older audience of when they were a kid, this is shown by the post-production (editing) by it being similar to what they recognise. Because it is recognisable and they know the main sorce makes it intertextuality and Post-modern. If someone had not seen the main sorce then it wouldn't be post-mondern to them or intertextuality.  
Here is an example of the original text:



The film 'Moulin Rouge' is a Postmodern text, and has features of Intertextuality.
Throughout the film there are various montages of music from the last 50 years such as The Beatles, Nirvana and David Bowie. The film takes place at the turn of the 20th century before this music had been released so is a Pastiche to the music played then as well as to Bollywood films and their style.

Example...

Theorists of intertextuality problematize the status of 'authorship', treating the writer of a text as the orchestrator of what Roland Barthes refers to as the 'already-written' rather than as its originator. This is stating that something we may think is new or recent my have been already done, also that nothing is original.