I have been working on this post and a large number of updates and uploads over the last couple of week or so, so I hope I haven't missed anything.
I finally got around to posting the keys stuff. I posted a big chunk of songs that cover all of the pro keys achievements other than the trainers, listed below. They are located in the directory found here. Keys work exactly the same as drums so just switch your pro adapter over to the "K" position and play away.
25 or 6 to 4, Antibodies, Cross Town Traffic, Foolin, Get Up Stand Up, Heart of Glass, I Love Rock N Roll, Imagine, In a Big Country, Just Like Heaven, Killing Loneliness, Last Dance, Llama, Midlife Crisis, Oye Mi Amor, Rainbow in the Dark, Rehab, Rock Lobster, Smoke on the Lobster, Space Oddity, Werewolves of London, Yoshimi Battles the Pink Robots.
I have a file for the pro keys trainers that works but still needs to be tidied up. I haven't posted it yet but that is on the top of my PBaE to do list so I hope to get it up pretty soon.
I am not going to list them all because there are too many, however if you requested it, it is probably there. All of the drum specific achievements that ripped MIDI files are available for should now be uploaded to the directory. Most of the files were submitted by anonymous contributors, but those that wished to be credited have been credited in the directory. Thank you all for your submissions. This would not have been possible without the community. I am going to have a community announcement in the next couple of weeks also.
There is also a project by PedroMontano that has been submitted to me that I put up. Pedro has come up with a method for playing guitar and bass on Rock Band 3 with the MIDI pro adapter. He has submitted instructions and a number of files that I have added to the Guitar and Bass directory. This method only works with Rock Band 3.
Now there are so many directories available that I have made a directory directory. I replaced the link to the drums directory in the sidebar with the directory directory.
I am going to try and have my first post for my new fun project up soon. It is almost finished I am just putting it all together so I hope you will all like that. I also plan on integrating some Google+ stuff into the site to make following posts and notification type things a bit easier. I would prefer to keep it Blogger only but it seems like that has been taken away and replaced with G+. If it still exists it is unfortunately too complicated for me to do, unless I am missing something.