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There is some good research here but it still needs a little more work to be fully effective:

• Post on Main Conventions of the Genre should read Conventions of Music Videos - you need really to reorder this - start with the general Goodwin stuff and a bit more detailed analysis of the Gaga song e.g. give an example of how the lyrics mirror the visuals... then compare to your metal example to see how it fits or is different to the pattern...could end with the idea that each music genre has its own specific genre requirements and list the metal features of music videos at the start... this would give it as more logical structure
• Two posts on metal videos are good but the first post needs to be more specific in its analysis - use examples e.g. how does Slipknot parody The Shining and why - what does it offer viewers?
• I think you also need to add a post on the general conventions of Metal - not just videos - could use some album covers or band shots - what instruments? what costume and style for performers? what type of performance?etc.
• Audience is nicely handled. 
• Institution - album sales - you need some comment about what this reveals for your project...Road Runner records post - spell out why you are looking at this? Remember that you are creating a new artist for this song but it needs to be an artist that would have a real home, so you could state that you will create an artist that could belong to the same label. Spell out the role of a label in the making of  a music video and how you think their marketing people would place the finished video and why... what else might the label do to promote the single/album?
• Branding - again, make clear that your brand will be your artist and that you will need to create a strong but unique image for them. This is created through their look, their performance and their logo?  The aim is that over time a consistent image is created by repeating these key elements? I would then move the stuff on Rob Zombie into Matt's post with the PP and state that you will look at this as a case study in how visuals, performance and logo help create an image... and what ideas you have at this stage.
• Don't forget the ancillary research requirements what are digipaks and album ads and what are the main things you need to remember for both of these...