Which music streaming service first introduced the concept of 'audio branding' with a distinctive two-note sonic logo that plays when their app launches?

Brand identity in the music industry extends beyond logos and album art. Sound logos, signature instruments, and distinctive audio elements form a crucial part of how artists and music companies establish recognition. This poll tests your knowledge of iconic sonic branding elements that have helped define major players in the music industry over the decades. Can you identify which audio signature belongs to which brand?

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Spotify (with its 'pop' sound followed by a three-beat melody)
Apple Music (with its soft piano chord progression)
Amazon Music (with its ascending three-note melody)
YouTube Music (with its four-note chime sequence)