Dear Ruby is a song played in the episode "Hair(Less): the Musical, Part 2".
Ruby: Dear Ruby,
Skull Boy: I really miss all your faces.
Ruby: But I'm seeing all these really great places.
Skull Boy: I wish you could see
All that I see.
Ruby: Which is different than Gloomsville, I must agree.
Skull Boy: (spoken) Ow!
(singing) Oops, I wasn't supposed to write that.
Ruby: Wonder what he's getting at?
What's great is this place is new and bizarre.
Skull Boy: (spoken) Hey, does anyone know where the Skeletunes are?
Ruby: Oops, did I write that down, too?
Skull Boy: I'm so excited
To be writing to you.
Well, Ruby, I must really go.
Ruby: As you know, we're doing a show.
Skull Boy: I wish you guys were here in this new land.
Ruby: I'd better go
And find my band.
Skull Boy: Yours truly, Skull Boy.