Which major design change did Spotify implement in its logo in 2015 that sparked significant user discussion?

The digital transformation of the music industry has revolutionized how we consume music. Streaming platforms have become the primary way people access music, replacing physical media and downloads. These platforms have not only changed distribution models but also how artists release music and interact with fans. Test your knowledge about the evolution of one of the most recognized music streaming services!

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They changed the shade of green to a slightly brighter hue
They added a musical note symbol to the wordmark
They switched from lowercase to uppercase lettering
They removed the sound waves from their icon