From summit23 discussion with akshaaatt:

We have a space to fill on the profile page, when a user first signs up and it's not populated yet. We can use this to guide people on what to do next and maybe have some fun as well!

Brainstormed text:

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*Welcome!
Now get listening*

Play some music on your device, here or on another music app. Come back later to view your listen stats, and share your music with old and new friends.

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Once we have playlist support add:

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Or click here to listen to ListenBrainz' most popular tracks of the week. [link to playlist of the most listened tracks this week, one track is always a rickroll?]

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Let me know if you want a mockup with a nice icon or something.
I've attached the pictures of what LB desktop shows - not super pretty but does the job!