Quote from peteroupc »For Vehicles that are creatures by some means other than Titania's Song's effect (such as by the crew ability [C.R. 702.121a]), Titania's Song will not affect those Vehicles (see also C.R. 613.5) (there is a dependency, for example, between the crew effect and Titania's Song; applying the crew effect first would change whether Titania's Song applies to that Vehicle, so the crew effect takes effect first [C.R. 613.7, 613.7a]).
But Titania's Song removes the crew ability, right? So this would only apply for Vehicles crewed before Titania's Song came down, and only until the end of the turn.