Nobody would ever associate a music note exclusively with a single music app. That is precisely the issue: a musical note is a generic symbol, not a brand identity. It’s like a phone receiver or a speech bubble everyone uses similar symbols because they represent universal functions.
That made sense when Apple Music was essentially just another music service.
Today, it has grown into a full fledged brand of its own. Apple has already been using the Apple logo alongside the word "Music" in promotional materials and other applications for years. The natural next step is to gradually retire the musical note and establish Music as the core visual identity of the service.
There is also the historical link to iTunes. The musical note carries that legacy, which might explain why Apple continues to hold on to it. However, Apple Music and iTunes are distinct products today. Why keep mixing their visual identities? Separate them once and for all, just as Apple has done with its other products and services.
Ultimately, people can suggest a thousand different colors, but none of them will fix the lack of a genuinely unique identity. Any music service can use a musical note; only Apple can turn the apple into an instantly recognizable symbol for Apple Music.