Copyrighting the ‘Building Blocks’ of Music? Why the Katy Perry Case Alarms Producers

Though in different keys and tempos, both songs feature a descending minor-key progression with evenly spaced B and C notes. This four-note progression is as basic as the major-scale power-chord riffs in punk, and Perry’s supporters argue that standard songwriting tropes like these should stay in the public domain.

Source: Copyrighting the ‘Building Blocks’ of Music? Why the Katy Perry Case Alarms Producers

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