KaraKKover

Hi. I want to make an app for karaoke for musicians. Meaning you will have access to for beginning around 50 songs that will be available for guitar, bass, keyboards and drums. All tracks will be done by a professional studio and recorded track by track. I will need some features to loop some parts of the song, change key and tempo(if possible). This is a diagram that I made to show how the flow would go. There will be a possibility to show the video of the progress of the song by chords, maybe the fingering on a tablet or fretboard, anyway I can explain this whenever you are available to start the project. I will be doing songs depending on different level skills and not specifically popular songs but challenging songs.
Please come back to me if you think you are able to do this.
Thanks for your time and looking forward to hearing from you.
Richard Drachman.