--[[
--  Music will get called with a string parameter indicating status.
--  Valid Parameters:
--    load    - game is loading.
--    land    - player landed.
--    takeoff - player took off.
--    combat  - Player just got a hostile on screen.
--    idle    - Current playing music ran out.
]]--
last = "idle"
function choose(str)
  if str == "load" then
    music.load("machina")
    music.play()

  elseif str == "land" then
    music.load("agriculture")
    music.play()

  elseif str == "takeoff" then
    music.load("liftoff")
    music.play()

  elseif str == "ambient" then
    music.load("machina")
    music.play()

  elseif str == "combat" then
    music.load("galacticbattle")
    music.play()

  elseif str == "idle" and last ~= "idle" then
    -- We'll play the same as last unless it was takeoff.
    if last == "takeoff" then
      choose("ambient")
    else
      choose(last)
    end
  end

  if str ~= "idle" then
    last = str -- Save the last string so we can use it.
  end
end