Not to be confused with Moonlight Sonata. Moonlight Serenade is an American swing ballad composed by Glenn Miller with subsequent lyrics by Mitchell Parish. In 1991, Miller's recording of Moonlight Serenade was inducted into the Grammy Hall of Fame.
Ice's weaknesses are negligible, for the most part, because you won't see much of the three types of Pokmon whose attacks are strong against them: Fighting, Fire, and Rock. Of those that are used, your Ice Pokmon should have little difficulty dealing with them.
Ice floats on water as it is less dense than the water, as the water molecules have more energy, because they're in the state of liquid. As ice is in the state of a solid, it is less dense [the particles do not have as much energy as the water], allowing it to float. However, the ice will melt after a while.