Not every messaging app supports this
This specific feature -- an auto-playing track tied to your profile page -- is not universal across messaging apps. Many popular apps, including WhatsApp, Telegram, and Messenger, do not offer a built-in profile-music feature at all, so check your specific app's profile edit screen for a music note icon before assuming it exists.
Licensing means the song library is limited
Available songs are pulled from a licensed music catalog built into the app, so not every song exists in the searchable library, and the exact songs you can choose from vary by region.
Frequently Asked Questions
Will the music play automatically for everyone who visits?
Yes -- once set, the track starts playing automatically whenever a friend opens your profile page, without them needing to tap anything.
Can I use my own MP3 file instead of a song from the library?
No, most apps that support this feature restrict you to searching their own licensed music catalog rather than uploading a personal audio file.