Initial key Text information frame.
The 'Initial key' frame contains the musical key in which the sound starts. It is represented as a string with
a maximum length of three characters. The ground keys are represented with "A","B","C","D","E", "F" and "G" and halfkeys represented
with "b" and "#". Minor is represented as "m". Example "Cbm". Off key is represented with an "o" only.
For more details, please refer to the ID3 specifications:
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