Enchantment, 3G (4) Each noncreature artifact loses its abilities and becomes an artifact creature with power and toughness each equal to its converted mana cost. If Titania's Song leaves play, this effect continues until end of turn.1
Illus. Kerstin Kaman
The "this effect continues until end of turn" applies to the entire continuous ability, so that if a new non-creature artifact entered play after this left play, it would become a creature as per the ability. [D'Angelo 2008/04/19]