The mash up is postmodern because they use Levi-Stauss idea of addition, subtraction, substitution and transposition. What the artist do is take two songs and put them together (transposition) and the mix them together and in some cases add a beat over the top (addition). 2 many djs also use substitution by using their own visuals they make in their live sets.

This may be considered as 'I know its bad, but its so bad its good' because It takes a very well know song from Salt 'N' Peppa which in itself is bad but good and then makes it sound as if a man with a Macintosh has just added beeps and bops over the top but becuase this new beat is catchy and we still like the original Salt 'N' Peppa song.

2 Many Dj's usually take two songs from different eras, this case Push It from the eighties and The Stooges - No Fun from the late sixties. They then add their own beat over the top to tie the two songs together. In their live sets they also have visuals behind relating to the song most likely to be their album artwork which has been edited to move. You would think that all of this going on at once would just create a racket with flashing images but you're wrong they strangely work.

Because they sample famous songs 2 Many DJ's may be considered mainstream but because of the mash up and addition beats it turns it to a niche market as cool people like to listen to how the songs are intertwined.

Because now days most people will listen to their music either on a MP3 Player/iPod, phone or on a computer it is possible to listen to a wide selection of music at the same time through either picking songs or using 'shuffle' that you can't get when listening to the album. What 'the mash up' does and 2 Many DJ's is take two song that could randomly come up in shuffle and don't fit the same genre and add them together.