I wouldn't "enter" the room in the usual sense; I'd teleport in with a very clean tornado effect; as the wind dies, I appear from underneath it (no crossfading, I'm just behind it). No music would fit this really... shame.

When walking into a room, the intro to "Fille de Vent" from Guilty Gear Isuka would play before I came through the door, then as the main song kicks in, I'd burst through the doorway.