How beautiful! This is really something to ponder over.

Sing : make musical sounds with the voice, especially words with a set tune.
Dance : move rhythmically to music, typically following a set sequence of steps.
Think : direct one's mind towards someone or something; use one's mind actively to form connected ideas.
Wonder : a feeling of amazement and admiration, caused by something beautiful, remarkable, or unfamiliar.
Ponder : think about (something) carefully, especially before making a decision or reaching a conclusion.

Synonym of Ponder is Think