The music is the Hymn to Joy but I'm not sure the lyrics are called that too.
I presumed it would be “beating the ground with small strokes.” , but terrestris, e is an adjective (in my dictionary).Terrestria doesn't agree with ictibus.
I learned two things with this sentence.Terrestria is a neuter plural adjective, here substantivized, i.e. used as a noun would be, meaning "terrestrial things".
Hint: Grandine gracieque moventi plerumque formor.Glacie et aqua moventi formor.
Videri et audiri semper non possum.
Ubi videri possum, silens aut sonorissimus sum. (Edit: changed verb to sum)
Altissimus plerumque sum.
(Would someone please translate the Latin so I know it is correct)