Characters
I am your singing telegram!
— Singing Telgram ‧ Clue

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker announces themselves as a singing telegram, a messenger whose delivery arrives as a song. The line is a cheerful, theatrical introduction, presenting the performance itself as the message. It states the role plainly and invites the listener to expect music rather than a plain note.
Context reviewed