This is a fascinating project proposal. I really like how you start off by setting out the dividing lines within cold war historiography. By using Pekacz and Mitchell you also effectively place your project within its historiographical context.
By highlighting local rock music as a tool of opposition and resistance, you make a compelling point for why your project is important. You move away from grand narratives of history, which see the Cold War as an ideological clash and look at the personal stories of the Cold War. As looking at local experiences is important to your project it may be worth looking at some scholarship on micro history, though this is just an idea.
I think your thematic approach is certainly appropriate for this essay as it will allow you to compare nations and movements. I am particularly interested by the section you say you will do on how the state regulated rock music. It may be worth comparing different state approaches across Eastern Europe as this may provide more context as to how much of a threat rock music was seen in these nations.
Your array of primary sources are novel and brilliant. I think it will be particularly interesting to use recordings of performances and lyrics. It may be worth trying to embed some of these sources within your work to give the reader some visual examples and further engage them.
I like that you already lay out counterarguments your project may face. The use of coded language is an interesting example of how musicians evaded censorship. However, does this not mean that these messages of dissent were only accessible to a few people. Surely if the messages of dissent were coded, they cannot be accessible to masses of young people.
Another small criticism is that using the term “fall of communism” may be a bit too broad. Communism fell across Europe for any different reasons. Whilst rock music may have contributed to its downfall in Germany and Poland you do not explore the impact of Rock music in nations like the USSR or Yugoslavia. Therefore, attributing the rise of rock music to the fall of communism may be too much of a generalisation.
Overall, I think this is an interesting project which will highlight the forgotten dissidents of Eastern Europe. I am really looking forward to seeing the finished result which I am sure will be a very enjoyable read.