NOTE: This is the adsupported free version of Key Signature Quiz, which only quizzes you on the treble clef signatures. The adfree version with treble and bass clef is available for 0.99 on the App StorennDo you wish you could look at any piece of sheet music and instantly recognize which key signature it is written in? This simple app quizzes you on both major and minor keys, from 0 to 7 sharps or 0 to 7 flats, so you can learn to visually recognize all the standard key signatures in written music.nnFor the fraction of the cost of a music lesson, you can memorize the key signatures wherever you are, in just minutes a day.nnCustomization features allow you to choose:n1 Major keys, Minor keys, or both.n2 Just sharps, just flats, or both.n3 No time limit, 5 seconds per question, or 10 seconds per question.nnYour results are stored in statistics, which you can view in a bar graph to chart your progress.nnEnjoy, and please let me know how it works for you nnGuitarists, Bassists, and Mandolin players: Check out Fret Surfer Fretboard Trainer, available for all three instruments