Just so i understand what the issue is for you, let’s say you want to add piano to a cover song, or add piano to your own song….
In a perfect world, what would you like TT or another developer to deliver? And no, I’m not saying EZkeys already does what you want it to do.
For example, are you wanting a product that can analyse data ( a song), and provide ideas of chords/melodies that could play/fit to such a song?
For me – and i am not after a response on whether the way i use it is useful or not, if I have a song ready and want to add piano, there wouldn’t be many midi files with EZkeys that would fit my song. However i have found at times a midi file that was interesting against my song, so i used it and edited it appropriately by way of changing chords and changing some of the melodic piano parts to suit my song. I would not have been able to think of something better as i don’t play piano. I needed inspiration (help) and have at times found it this way. I do the same thing with ezdrummer.
I also have resonated with some midi files that come with EZkeys or midi packs, and i cut and past, edit, turn upside down some midi files to get something i find pleasing and can go about adding guitars, bass and drums to. My piano skillset would never have allowed me to find this song that i have generated from multiple midi files across different midi packs. I do the same thing with EZdrummer.
What do i need? A load more Pop, Rock, Ballad midi packs! 
More opportunities and inspiration please!
