Adding Features To My App (Need an iOS dev with musical background)

I need an iOS developer with a background in music-making. If you know how to read and write sheet music, and you are an iOS developer, you're perfect for this project. Basically, I have an app that allows the user to write sheet music by dragging-and-dropping musical notes onto the page. I'm not an expert on musical notation, so I need someone who knows sheet music well to touch it up and make it perfect for a musician writing music. The second, and biggest part will be adding the piano feature. There is a piano at the bottom of the screen. As the user plays the piano, music notes appear on the screen. So if the user plays a tune, that tune will now be represented by musical notes in the sheet music page. This may be a difficult concept to explain, so I have a video of what I would like the app to look like. The ability to then play exactly what they just played back to them would be a must as well. The start-time no this app will be about a day or two, and needs to be finished as soon as you can do it. - You may need to provide some missing assets... such as the piano sound. I have most music notes, but am missing the ones for piano. - This is an app for both iPhone and iPad, but the piano part of this project is iPad only. - You will need to sign a Non-Disclosure agreement before starting this project. - There aren't super strict guidelines on this one. I have objectives that need to be done, but you can use your own discretion as well with what you think will be best.