I can’t say we can agree on this.
It’s the same thing.
1) Baker avails himself of becoming a public place of accommodation then he opens his shop and bakes a cake.
2) Artist avails themselves to having their songs become part of the public domain once they sell their songs to the public.
3) Once the works either it be a cake or a song are available for public consumption, the baker and artist can not discriminate as to who can purchase their goods.
4) Refusing to allow a song to be played and refusing to bake a cake are in essence the same thing. Both goods are open for purchase by the public. Once that happens, you can not discriminate as to who buys your product.
There’s no discernible difference between the two.
Unsure we are communicating well here. To clarify do you see a difference between queen playing live at the RNC or being asked to compose a custom song in honor of Trump vs Trump just playing a recording that was already made for general consumption like he did?