In 2009, I took music lessons and needed to study reading music. I found no well designed reading apps so I decided to make my own. I taught myself obejective-c and created Note Guru for iOS.  Note Guru is a simple app that tests your knowledge of music notation. It allows you to test treble and bass notes as well as extended notes. I had great fun on this one and was a great feeling hearing from the public on how it helped them learn to read music.