Which music streaming platform launched a highly successful sonic branding campaign in 2019 featuring a distinctive 'ping' sound that became central to their global marketing strategy?

In the music industry, brand identity extends beyond visual elements to the sonic realm. Major music streaming platforms have developed distinctive audio signatures that help consumers instantly recognize their brand. This form of retail branding has become increasingly important in an audio-first world, where consumers may interact with services without visual interfaces. Test your knowledge about this fascinating intersection of music retail and branding strategy!

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Spotify, with their 'Sound of Premium' ping that plays before personalized playlists
Apple Music, with their 'Harmony Tone' that signals exclusive content
Tidal, with their 'High Fidelity Indicator' sound marking lossless audio tracks
Amazon Music, with their 'Echo Signature' that integrates with Alexa devices