Existing posters within the genre

 These are some existing posters within the same genre. The first and the last both have the album cover of the album it is advertising as the main background. However, these are extended to fill the non square shape. in the bottom poster it is not stretched, it has extra imagery that is not featured on the front cover although follows the same style and layout. 
The layout of text on the first is very minimal. This could be due to the art being the focus which is common of the genre as expression is a key focus.
The second poster uses photography as the main focus. However the picture on the left one is similar to the one on the front cover but not in negative. This therefore creates some continuity between the poster and the cover although it is a different photograph.

All three of the poster incorporate the name of the album and the name of the band, they also use the bands recognizable logos and font styles. This creates continuity between the bands products making them effective.