Creating the red stripe was fairly easy and adds more colour which nicely contrasts with the guitarist jumper and the text shadows. I opened a new document on drew a straight line on the page. I then used the 'deform' effect to make allow it to curl round, as shown. I then used the brush tool and the opacity to draw a line down the thin line created. I then inserted it onto the poster behind everything else by dragging it down layers.
The most interesting technique I used was the shadows of the guitarists. I used the brush tool on a new layer with a large, low gradient brush. I then painted round the sides of the models and then lowered the opacity to make them less visible. The layer was then moved beneath the models so it looked like a shadow behind them.
I created the drummer using the paint tool in photoshop. by using a think brush I draw the outline and then filled in with a block colour to create a sillohette.