iPhone app 5ths Machine download it using MyAndroid.

Think you know your key signatures cold? Answer this: which key has 41 sharps?

The equal temperament system is a circle with 12 positions, just like a clock.
And, just like on a clock, the hands keep going around and around forever.
The key signature of 41 sharps is theoretically consistent with the Western diatonic system learn why, and learn how to find out what key it is.
The Background Information and the Quiz Tips explain the system in detail, and Chronology puts it all in perspective.

Enjoy the Perpetual 5ths Machine Boogie while key signatures youve never seen before pass by on parade.
Then, buckle down and solve the Quiz questions.
NOW you understand music theory the 5ths Machine way!,

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