Which music streaming platform was the first to successfully implement 'Personalized Audio Ads' that dynamically change based on a user's listening history?

In the music industry, sonic branding has become a powerful marketing strategy where companies create distinctive audio signatures to enhance brand recognition. These audio logos can become as recognizable as visual logos and significantly impact consumer recall. This poll tests your knowledge of a groundbreaking sonic branding innovation that revolutionized how music and marketing intersect.

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Spotify with its Streaming Ad Insertion technology (2020)
Apple Music with its Dynamic Audio Marketing system (2019)
Pandora with its Responsive Audio Framework (2018)
Amazon Music with its Listener-Adaptive Advertising (2021)