The Space Symphony ship is a huge ship, although not as large as the Luxury Spacecraft G, in Space Channel 5 Part 2. Many people climb aboard for reasons stretching from business to relaxation. It is aboard this ship during Ulala's comeback show that the mysterious dance troupe, the Rhythm Rogues, attack the spaceship and force everyone to boogie.
Aside from the lounge area full of TV monitors and windows to the outside, there is also a Lookout Dome at the back of the ship. It's a room full of televisions, and it's speculated that the platings around the room might be able to retract and reveal windows. This is where Ulala first sees Purge's silhouette, as well as where the Kin Kon Kan battle occurs.